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SELECTIONS: Products : HEADERS : CHROME : CHEVY/GMC
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THY-327Y
1928-1938 ROADSTER/STREET RODS, STOPS AT END OF THE BLOCK; 1955-1957 TRUCK, BLOCKHUGGER, 2/4WD; 283-400
List Price: $675.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-311Y
1955-1957, 265-400, STOCK FRONT MOUNTS OR DANCHUCK KIT
List Price: $694.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-300Y-S
1961-1966 TRUCK/SUBURBAN/BLAZER/JIMMY 283-400, AUTOMATIC ONLY, 2/4WD; 1973-1987 ...
List Price: $767.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1961-1966 TRUCK/SUBURBAN/BLAZER/JIMMY 283-400, AUTOMATIC ONLY, 2/4WD; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY 283-400, 2WD, WITH SMOG FITTINGS
1961-1966: AUTOMATIC ONLY. MAY REQUIRE ALT/GEN BRACKET.
1973-1987: 2WD ONLY....
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THY-300Y
1961-1966 TRUCK/SUBURBAN/BLAZER/JIMMY 283-400, AUTOMATIC ONLY, 2/4WD; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY 283-400, 2WD
List Price: $736.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1961-1966: AUTOMATIC ONLY. MAY REQUIRE ALT./GEN. BRACKET....
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THY-300Y-DA
1961-1966 TRUCK/SUBURBAN/BLAZER/JIMMY 283-400, AUTOMATIC ONLY, 2/4WD; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY...
List Price: $749.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1961-1966 TRUCK/SUBURBAN/BLAZER/JIMMY 283-400, AUTOMATIC ONLY, 2/4WD; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY 283-400, 2WD
WITH DUAL AIR FITTINGS.
1961-1966: AUTOMATIC ONLY. MAY REQUIRE ALT./GEN. BRACKET....
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THY-331
1965-1972 CUTLASS/442, 400-455, NO CONVERTIBLES, NO 350 ENG.
List Price: $773.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-376Y1
1967-1969, 283-400, Z-28, NO COLUMN SHIFT, NO A/C
List Price: $733.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-376Y1-S
1967-1969, 283-400, Z-28, NO COLUMN SHIFT, NO A/C, WITH SMOG FITTINGS
List Price: $767.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-372Y
1967-1972 TRUCK/SUBURBAN, 283-400, 2/4WD
List Price: $731.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-372Y-S
1967-1972 TRUCK/SUBURBAN, 283-400, 2/4WD, WITH SMOG FITTINGS
List Price: $763.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-313
1967-1974 CAMARO, 1968-1974 NOVA, 1966-1974 CHEVELLE/EL CAMINO, 396-454, AUTO ONLY
List Price: $682.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-313-S
1967-1974 CAMARO, 1968-1974 NOVA, 1966-1974 CHEVELLE/EL CAMINO, 396-454, AUTO ONLY, WITH SMOG FITTINGS
List Price: $620.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-341
1967-1974 FIREBIRD/TRANS AM; 1970-1974 GRAND PRIX; 1964-1973 GTO/LEMANS...
List Price: $716.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1967-1974 FIREBIRD/TRANS AM; 1970-1974 GRAND PRIX; 1964-1973 GTO/LEMANS, STOCK MOTOR MOUNTS; 326-455 (PONTIAC MOTOR), 3 TUBE HEADER, D-PORTS ONLY...
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THY-375Y
1967-1985 CAMARO; 1968-1977 NOVA; 1968-1985 CHEVELLE/EL CAMINO, 265-400
List Price: $725.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-375Y-S
1967-1985 CAMARO; 1968-1977 NOVA; 1968-1985 CHEVELLE/EL CAMINO, 265-400, TRI-Y, WITH SMOG FITTINGS
List Price: $757.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-377Y1
1968-1972, 283-400, NO COLUMN SHIFT, NO A/C
List Price: $733.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-332
1968-1974 350 OLDS., NO ENG. SWAPS, NO 455 ENG., NO TYPE-S
List Price: $773.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-350-S
1968-1977 CORVETTE, 283-400, NO SIDE PIPES, WITH SMOG FITTINGS
List Price: $792.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-350
1968-1977, CORVETTE 283-400, NO SIDE PIPES
List Price: $660.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-315Y
1970-1987 G-SERIES VANS/MINI MOTORHOME, 283-400
List Price: $730.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-315Y-DA
1970-1987 G-SERIES VANS/MINI MOTORHOME, 283-400, WITH DUAL AIR FITTINGS
List Price: $620.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-315Y-S
1970-1987 G-SERIES VANS/MINI MOTORHOME, 283-400, WITH SMOG FITTINGS
List Price: $765.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-380
1971-1994 PASSENGER CARS; 1976 CAMARO; 1978-1979 NOVA/CHEVY II; 1964-1987 CHEVELLE/EL CAMINO; 1970-1987 MONTE CARLO, 265-400,...
List Price: $626.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1971-1994 PASSENGER CARS; 1976 CAMARO; 1978-1979 NOVA/CHEVY II; 1964-1987 CHEVELLE/EL CAMINO; 1970-1987 MONTE CARLO, 265-400, 4:1, MAX GROUND CLEARANCE...
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THY-355Y
1973-1978, 403-455 OLDS., FRONT WHEEL DRIVE, w/ TANDEM REAR WHEELS, NO REVCON
List Price: $801.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-364Y1
1973-1987 TRUCK, 1973-1991 SUBURBAN/BLAZER/JIMMY, 283-400, WITH HEAT RISER, 4WD
List Price: $944.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y1
1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, WITH HEAT RISER, 2WD
List Price: $927.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-367Y1-DA
1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, WITH HEAT RISER, 2WD, WITH DUAL AIR FITTINGS
List Price: $943.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y1-S
1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, WITH HEAT RISER, 2WD, WITH SMOG FITTINGS
List Price: $973.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y2
1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 2WD
List Price: $871.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y2-DA
1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 2WD, WITH DUAL AIR FITTINGS
List Price: $887.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y2-S
1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 2WD, WITH SMOG FITTINGS
List Price: $916.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-304Y
1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY, 366-454, 4WD
List Price: $763.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-304Y-S
1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY, 366-454, 4WD, WITH SMOG FITTINGS
List Price: $801.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y-DA
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, NO CAT., 4WD, WITH DUAL AIR FITTINGS
List Price: $749.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y-S
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, NO CAT., 4WD, WITH SMOG FITTINGS
List Price: $770.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y10
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4 INCH-6 INCH LIFT KIT, 4WD
List Price: $849.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y10-DA
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD, WITH DUAL AIR FITTINGS
List Price: $909.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y10-S
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD, WITH SMOG FITTINGS
List Price: $909.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y4
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, NO BLAZER, 4WD
List Price: $950.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-364Y4-S
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, NO BLAZER, 4WD, WITH SMOG FITTINGS
List Price: $982.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y4-DA
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET...
List Price: $960.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, NO BLAZER, 4WD, WITH DUAL AIR FITTINGS...
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THY-364Y3-S
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITHOUT HEAT RISER
List Price: $926.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, NO BLAZER, 4WD, WITH SMOG FITTINGS...
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THY-364Y3
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, NO BLAZER, 4WD
List Price: $894.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y3-DA
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET...
List Price: $905.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1973-1987 TRUCK; 1973-1991 SUBURBAN, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, NO BLAZER, 4WD, WITH DUAL AIR FITTINGS...
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THY-364Y
1973-1987 TRUCK; 1973-1991 SUBURBAN/BLAZER/JIMMY, 283-400, NO CAT., 4WD
List Price: $738.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y1-DA
1973-1987 TRUCK; 1973-1991 SUBURBAN/BLAZER/JIMMY, 283-400, WITH HEAT RISER, 4WD, WITH DUAL AIR FITTINGS
List Price: $955.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y1-S
1973-1987 TRUCK; 1973-1991 SUBURBAN/BLAZER/JIMMY, 283-400, WITH HEAT RISER, 4WD, WITH SMOG FITTINGS
List Price: $976.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y2
1973-1987 TRUCK; 1973-1991 SUBURBAN/BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 4WD
List Price: $888.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y2-DA
1973-1987 TRUCK; 1973-1991 SUBURBAN/BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 4WD, WITH DUAL AIR FITTINGS
List Price: $899.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y2-S
1973-1987 TRUCK; 1973-1991 SUBURBAN/BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 4WD, WITH SMOG FITTINGS
List Price: $920.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y8
1973-1991 BLAZER/JIMMY, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD
List Price: $948.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-364Y8-S
1973-1991 BLAZER/JIMMY, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD, WITH SMOG FITTINGS
List Price: $980.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-364Y8-DA
1973-1991 BLAZER/JIMMY, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD...
List Price: $959.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1973-1991 BLAZER/JIMMY, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD, WITH DUAL AIR FITTINGS...
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THY-364Y6
1973-1991 BLAZER/JIMMY, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4WD
List Price: $943.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y6-DA
1973-1991 BLAZER/JIMMY, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4WD, WITH DUAL AIR FITTINGS
List Price: $953.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y6-S
1973-1991 BLAZER/JIMMY, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 4WD, WITH SMOG FITTINGS
List Price: $975.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y7
1973-1991 BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD
List Price: $893.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y7-S
1973-1991 BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD, WITH SMOG FITTINGS
List Price: $925.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-364Y7-DA
1973-1991 BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT...
List Price: $903.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1973-1991 BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 4-6 INCH LIFT KIT, 4WD, WITH DUAL AIR FITTINGS...
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THY-364Y5
1973-1991 BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 4WD
List Price: $887.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y5-DA
1973-1991 BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 4WD, WITH DUAL AIR FITTINGS
List Price: $898.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-364Y5-S
1973-1991 BLAZER/JIMMY, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 4WD, WITH SMOG FITTINGS
List Price: $919.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y4
1973-1991 SUBURBAN/BLAZER/JIMMY; 1973-1987 TRUCK, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 2WD
List Price: $930.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y4-DA
1973-1991 SUBURBAN/BLAZER/JIMMY; 1973-1987 TRUCK, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 2WD, WITH DUAL AIR FITTINGS
List Price: $946.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y4-S
1973-1991 SUBURBAN/BLAZER/JIMMY; 1973-1987 TRUCK, 283-400, WITH HEAT RISER, 3 INCH CAT. INLET, 2WD, WITH SMOG FITTINGS
List Price: $976.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y3
1973-1991 SUBURBAN/BLAZER/JIMMY; 1973-1987 TRUCK, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 2WD
List Price: $874.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y3-DA
1973-1991 SUBURBAN/BLAZER/JIMMY; 1973-1987 TRUCK, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 2WD, WITH DUAL AIR FITTINGS
List Price: $890.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-367Y3-S
1973-1991 SUBURBAN/BLAZER/JIMMY; 1973-1987 TRUCK, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET...
List Price: $921.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1973-1991 SUBURBAN/BLAZER/JIMMY; 1973-1987 TRUCK, 283-400, WITHOUT HEAT RISER, 3 INCH CAT. INLET, 2WD, WITH SMOG FITTINGS...
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THY-367Y
1973-1991 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, 2WD
List Price: $647.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-367Y-DA
1973-1991 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, 2WD, WITH DUAL AIR FITTINGS
List Price: $620.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-367Y-S
1973-1991 TRUCK/SUBURBAN/BLAZER/JIMMY, 283-400, 2WD, WITH SMOG FITTINGS
List Price: $620.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-303Y
1975-2000 CLASS A MOTORHOME P-30 CHASSIS ONLY; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY; 366-454, 2WD
List Price: $746.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-303Y-DA
1975-2000 CLASS A MOTORHOME P-30 CHASSIS ONLY; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY; 366-454, 2WD...
List Price: $757.00
1975-2000 CLASS A MOTORHOME P-30 CHASSIS ONLY; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY; 366-454, 2WD, WITH DUAL AIR FITTINGS...
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THY-303Y-S
1975-2000 CLASS A MOTORHOME P-30 CHASSIS ONLY; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY; 366-454...
List Price: $781.00
1975-2000 CLASS A MOTORHOME P-30 CHASSIS ONLY; 1973-1987 TRUCK/SUBURBAN/BLAZER/JIMMY; 366-454, 2WD, WITH SMOG FITTINGS...
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THY-378Y1
1978-1987, 283-400, Z-28, WITH HEAT RISER, 2-1/4 INCH CAT. INLET
List Price: $928.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-378Y1-S
1978-1987, 283-400, Z-28, WITH HEAT RISER, 2-1/4 INCH CAT. INLET, WITH SMOG FITTINGS
List Price: $964.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-354Y
1979-1990, 366-454, REVCON FRONT WHEEL DRIVE, 2WD
List Price: $560.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-354Y-S
1979-1990, 366-454, REVCON FRONT WHEEL DRIVE, 2WD, WITH SMOG FITTINGS
List Price: $620.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y4-S
1981-1985 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITHOUT HEAT RISER, 3 inch CAT. INLET, WITH SMOG FITTINGS
List Price: $954.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y1
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITH HEAT RISER
List Price: $922.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y3
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITH HEAT RISER
List Price: $870.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
3 INCH CAT INLET....
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THY-316Y3-DA
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITH HEAT RISER, 3 inch CAT. INLET, WITH DUAL AIR FITTINGS
List Price: $881.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y1-DA
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITH HEAT RISER, WITH DUAL AIR FITTINGS
List Price: $933.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y1-S
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITH HEAT RISER, WITH SMOG FITTINGS
List Price: $954.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y2
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITHOUT HEAT RISER
List Price: $870.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y4
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITHOUT HEAT RISER, 3 inch CAT. INLET
List Price: $922.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y4-DA
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITHOUT HEAT RISER, 3 inch CAT. INLET, WITH DUAL AIR FITTINGS
List Price: $933.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y2-DA
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITHOUT HEAT RISER, WITH DUAL AIR FITTINGS
List Price: $881.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-316Y2-S
1981-1995 G-SERIES VANS/MINI MOTORHOME, 5.0L-5.7L, WITHOUT HEAT RISER, WITH SMOG FITTINGS
List Price: $902.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
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THY-377Y1-S
1986-1972, 283-400, NO COLUMN SHIFT, NO A/C, WITH SMOG FITTINGS
List Price: $767.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-399Y3
1986-1991 2-DOOR TRUCK, 366-454, 1 TON, STOCK OR LOWERED, 3 INCH CAT. INLET, 2WD ONLY
List Price: $870.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-399Y3-S
1986-1991 2-DOOR TRUCK, 366-454, 1 TON, STOCK OR LOWERED, 3 INCH CAT. INLET, 2WD ONLY, WITH SMOG FITTINGS
List Price: $911.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-399Y2
1986-1991 4-DOOR TRUCK, 366-454, STOCK OR LOWERED, 3 INCH CAT. INLET, 2WD ONLY
List Price: $878.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-399Y2-S
1986-1991 4-DOOR TRUCK, 366-454, STOCK OR LOWERED, 3 INCH CAT. INLET, 2WD ONLY, WITH SMOG FITTINGS
List Price: $919.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-399Y1
1986-1991, 366-454, STOCK OR LOWERED, 3 INCH CAT. INLET, 2WD ONLY
List Price: $876.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-399Y1-S
1986-1991, 366-454, STOCK OR LOWERED, 3 INCH CAT. INLET, 2WD ONLY, WITH SMOG FITTINGS
List Price: $909.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-306Y1
1987-1994 CLASS A MOTORHOME, 366-454, TURBO 400 (P-R-N-D-2-1) AUTO TRANS., 3 inch CAT. INLET, 2WD
List Price: $945.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-306Y1-S
1987-1994 CLASS A MOTORHOME, 366-454, TURBO 400 (P-R-N-D-2-1) AUTO TRANS., 3 inch CAT. INLET, 2WD, WITH SMOG FITTINGS
List Price: $977.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
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THY-388Y
1988-1995 2-DOOR TRUCK ONLY; 1992 1/2-1995 TRUCK/SUBURBAN, 366-454, NO LIFT KITS, 3 INCH CAT. INLET, 2/4WD
List Price: $899.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-388YL
1988-1995 2-DOOR TRUCK ONLY; 1992.5-1995 TRUCK/SUBURBAN, 366-454 (7.4L), STOCK OR LOWERED, 3 INCH CAT. INLET, 2WD
List Price: $734.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-388YL-S
1988-1995 2-DOOR TRUCK ONLY; 1992.5-1995 TRUCK/SUBURBAN, 366-454 (7.4L), STOCK OR LOWERED...
List Price: $795.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1988-1995 2-DOOR TRUCK ONLY; 1992.5-1995 TRUCK/SUBURBAN, 366-454 (7.4L), STOCK OR LOWERED, 3 INCH CAT. INLET, 2WD, WITH SMOG FITTINGS...
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THY-388Y-S
1988-1995 2-DOOR TRUCK ONLY; 1992.5-1995 TRUCK/SUBURBAN, 366-454, NO LIFT KITS, 3 INCH CAT. INLET, 2/4WD, WITH SMOG FITTINGS
List Price: $931.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers! ...
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THY-385Y1
1988-1995 2-DOOR TRUCK; 1992-1995 4-DOOR TRUCK/SUBURBAN/BLAZER, 283-400, NO ABS...
List Price: $906.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1988-1995 2-DOOR TRUCK; 1992-1995 4-DOOR TRUCK/SUBURBAN/BLAZER, 283-400, NO ABS, CLAMPED CAT. UNDER PASSENGER SEAT, 2WD...
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THY-385Y1-S
1988-1995 2-DOOR TRUCK; 1992-1995 4-DOOR TRUCK/SUBURBAN/BLAZER, 283-400, NO ABS...
List Price: $944.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1988-1995 2-DOOR TRUCK; 1992-1995 4-DOOR TRUCK/SUBURBAN/BLAZER, 283-400, NO ABS, CLAMPED CAT. UNDER PASSENGER SEAT, 2WD, WITH SMOG FITTINGS...
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THY-385Y1-DA
1988-1995 2-DOOR TRUCK; 1992-1995 4-DOOR TRUCK/SUBURBAN/BLAZER, 283-400, NO-ABS!, CLAMPED CAT. UNDER PASSENGER...
List Price: $920.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1988-1995 2-DOOR TRUCK; 1992-1995 4-DOOR TRUCK/SUBURBAN/BLAZER, 283-400, NO-ABS!, CLAMPED CAT. UNDER PASSENGER SEAT, 2WD, WITH DUAL AIR FITTINGS...
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THY-383Y1-DA
1988-1995 2-DOOR TRUCK; 1992-1995 4-DOOR TRUCK/SUBURBAN/BLAZER/YUKON, 283-400, CLAMPED CAT. UNDER PASSENGER SEAT...
List Price: $944.00
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!
1988-1995 2-DOOR TRUCK; 1992-1995 4-DOOR TRUCK/SUBURBAN/BLAZER/YUKON, 283-400, CLAMPED CAT. UNDER PASSENGER SEAT, ABS-OK, 2WD, WITH DUAL AIR FITTINGS...
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