A Doug Thorley Headers original design, the 4:2:1 collector specification on the Tri-Y Header is engineered to match your engine’s firing order and thereby maximize exhaust scavenging – the complete expulsion of gasses on the exhaust stroke. The Tri-Y design creates more usable power and torque than any other header design, making it the header of choice for enthusiasts who want the most bang for their buck.
- Street legal in all 50 states (most applications)
- Super tough 3/8” flanges and 14 gauge tubing
- Compliant to the toughest emission standards
- Maximum torque and horsepower boost
- A Doug Thorley Headers original design
- 100% Made in America
- Durable ceramic coating