GMC Sierra 2009-2013, Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Y-Pipes by Doug Thorley Headers®. Collector Outlet Diameter: 2.5". Emissions: CARB compliant. Header Style: Long Tube. Doug's headers are designed to outflow your stock exhaust manifolds by leaps and bounds. Their headers will increase the power of your motor across the widest RPM band possible. That is the beauty of the design, and that is why they are the best street header available.
Fitment notes: This is a CARB compliant part, legal for use on vehicles built to meet CARB standards and/or registered in California and other states which follow CARB standards.
|Header Material: Steel|
|Header Style: Long Tube|
|Collector Diameter: 2.5"|
|Emissions: CARB compliant|
|Header Style: 4:2:1 Long-Tube Tri-Y|
|Finish: Silver Ceramic Coated|
|Weld Up: No|
|Primary Tube Gauge: 14 Gauge|
|Collector Diameter: 2-1/2"|
|Flange Thickness: 3/8"|
|Bolts and/or Studs Included: Yes|
|Gaskets Included: Yes|
|Reducers Included: N/A|
|Y-Pipe Inlet Diameter: 2-1/2"|
|Catalytic Converter(s) Included: No|
|Quantity: Sold as a Complete Kit|
|Warranty: Limited Lifetime to original purchaser|
- High quality at an affordable price
- Expertly made from premium materials
- Built to match your exact requirements
Doug's Long Tube Headers replace restrictive stock exhaust manifolds with long primary tubes designed to dramatically increase the flow of exhaust gasses, and reduce power robbing back pressure within the exhaust system. Allowing the engine to breathe more freely improves power and efficiency, making Doug's Long Tube Headers one of the most cost-effective modifications you can make to your vehicle.
The Long Tube Header is perfect for any high performance street or strip application. Each header is constructed from thick wall steel, and all come finished with Doug's beautiful ceramic coating for long-lasting performance.
For over 50 years, Doug Thorley Headers has been an innovator in the automotive aftermarket. Driven by a passion for performance and superior quality, they are committed to developing 100% American-made products that will reliably deliver maximum horsepower and torque. Doug Thorley Headers® has been pushing the limits of automotive technology since they first invented the Tri-Y header in 1958, and they do it all on American soil.