CAT-BACK, 2007 TOYOTA TUNDRA 4.7L
The absolute simplest way to make power is to bolt on a Doug Thorley Headers 50-state legal exhaust system.
Precise CNC mandrel bends,...
2007, 5.7L, 2/4WD, TUNDRA
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
1999-2004, 6.8L, 2/4WD, F250 & F350 SUPER-DUTY
It's a proven, indisputable fact: Dollar for dollar, no other investment will increase power and performance like a set of Doug Thorley Headers!...
Doug Thorley Headers partakes in "Project Nightmare"
Truckin' Magazine's 1967 Chevy C-10 "Nightmare" has made it's way to Doug Thorley! It's powdercoated frame, equipped with a newly installed 2004 GTO LS1, has been test...
Gallery 1 Vehicle Photos...
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March 8, 2008
TOYOTA ONLY Dyno Day!
Doug Thorley will be doing a TOYOTA ONLY dyno day! Come join us at our R&D Department on March 8th...
