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Doug Thorley - 2001-2011 Chevy/GMC 8.1L Motorhome (W-Series Chassis) Long Tube Headers


4:1 Stainless Long Tube Headers with Connector Pipes
2001-11 GM Class A Motorhome (W-Series Workhorse Chassis)

Header Information: Backed by over 50 years of knowledge and experience, Doug Thorley Headers are designed to outflow your stock exhaust manifolds by leaps and bounds. These headers will give your engine more horsepower and torque across the entire RPM range while increasing your gas mileage potential. To make these headers last, we made them out of industry-leading T304 stainless steel tubing with 3/8" thick flanges. All of this is 100% American-made, and backed by our lifetime warranty of course!

Header Style: 4:1 Long Tube Headers
Material: T304 Stainless Steel
Finish: Natural
Weld Up: No
Primary Tube Diameter (in): 1-3/4"
Primary Tube Gauge: 14 Gauge
Collector Attachment: 3-Bolt Flange
Collector Diameter: 3"
Tuned: No
Flange Thickness: 5/8"
Bolts and/or Studs Included: Yes
Gaskets Included: Yes
Reducers/Adapters Included: No
Connector Pipes Included: Yes
Y-Pipe Inlet Diameter: 3"
Y-Pipe Outlet Diameter: 3"
Catalytic Converter(s) Included: No
Quantity: Sold as a Complete Kit
CARB E.O. #: D-540-3
Warranty: Limited Lifetime to original purchaser

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