"DTH" Doug Thorley Headers
- Doug Thorley Headers®Steel 4-2-1 Tri-Y Exhaust Header Kit with Y-Pipes (THY-637Y-C)Steel 4-2-1 Tri-Y Exhaust Header Kit with Y-Pipes by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 3". This complete header kit makes huge increases in the power output of your V8 Grand Cherokee....Made to provide unequaled quality and reliabilityMade with the use of the latest technologies$1,236.09
- Doug Thorley Headers®Steel 4-2-1 Tri-Y Exhaust Header Kit with Y-Pipes (THY-630Y-C)Steel 4-2-1 Tri-Y Exhaust Header Kit with Y-Pipes (THY-630Y-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 3". This complete header kit makes huge increases in the power output of your V8 Grand...Made to provide unequaled quality and reliabilityMade with the use of the latest technologies$1,198.93
- Doug Thorley Headers®Steel Long Tube 3-1 Exhaust Header Kit with Y-Pipes (THY-505-C)Steel Long Tube 3-1 Exhaust Header Kit with Y-Pipes (THY-505-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.5". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes noticeable increases in...High quality at an affordable priceExpertly made from premium materials$1,008.87
- Doug Thorley Headers®Steel Long Tube 3-1 Exhaust Headers (THY-465-L-C)Steel Long Tube 3-1 Exhaust Headers by Doug Thorley Headers®. Primary Tubing Diameter: 1.5". Collector Outlet Diameter: 1.75". Header Style: Long Tube. These long tube headers really make a difference in the power output of your Nissan....High quality at an affordable priceExpertly made from premium materials$651.62
- Doug Thorley Headers®Steel Long Tube 3-1 Exhaust Headers (THY-516-L-C)Steel Long Tube 3-1 Exhaust Headers (THY-516-L-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.25". Header Style: Long Tube. This long tube header kit really wakes up the 4.0L Toyota motor....High quality at an affordable priceExpertly made from premium materials$641.62
- Doug Thorley Headers®Steel Long Tube 3-1 Exhaust Headers (THY-470-L-C)Steel Long Tube 3-1 Exhaust Headers by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.25". Header Style: Long Tube. These long tube headers will really wake up your 4.0L Nissan motor. The simple...High quality at an affordable priceExpertly made from premium materials$620.19
- Doug Thorley Headers®Steel Long Tube 3-1 Exhaust Headers with Adapters (THY-341-C)Steel Long Tube 3-1 Exhaust Headers with Adapters by Doug Thorley Headers®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 3". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's headers are...High quality at an affordable priceExpertly made from premium materials$848.83
- Doug Thorley Headers®Steel Long Tube 4 To 1 Exhaust Headers (THY-265-2V-C)Steel Long Tube 4 To 1 Exhaust Headers by Doug Thorley Headers®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 3". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's headers are designed to...High quality at an affordable priceExpertly made from premium materials$900.27
- Doug Thorley Headers®Steel Long Tube 4 To 1 Exhaust Headers with Adapters (THY-313-C)Steel Long Tube 4 To 1 Exhaust Headers with Adapters by Doug Thorley Headers®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 3". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's headers...High quality at an affordable priceExpertly made from premium materials$915.99
- Doug Thorley Headers®Steel Long Tube 4 To 1 Exhaust Headers with Resonators (THY-325-C)Steel Long Tube 4 To 1 Exhaust Headers with Resonators by Doug Thorley Headers®. Collector Outlet Diameter: 3". Header Style: Long Tube. Get the most out of your LS powered sand rail by installing these quality 4:1 long tube headers...High quality at an affordable priceExpertly made from premium materials$875.98
- Doug Thorley Headers®Steel Long Tube 4-1 Stepped Exhaust Headers (THY-320-C)Steel Long Tube 4-1 Stepped Exhaust Headers (THY-320-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 3". Header Style: Long Tube. These headers are the perfect kit to complete your LS motor swap...High quality at an affordable priceExpertly made from premium materials$901.70
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit (THY-333Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit by Doug Thorley Headers®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 2.25". Header Style: Long Tube. Doug's headers are designed to outflow your stock exhaust manifolds by...High quality at an affordable priceExpertly made from premium materials$927.42
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit (THY-560Y2-L-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes huge increases in power output of your...High quality at an affordable priceExpertly made from premium materials$981.72
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit (THY-560Y1-L-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes huge increases in power output of your...High quality at an affordable priceExpertly made from premium materials$1,110.33
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit (THY-560Y3-L-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes huge increases in power output of your...High quality at an affordable priceExpertly made from premium materials$803.10
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-339Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes by Doug Thorley Headers®. Primary Tubing Diameter: 1.875". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes huge increases in...High quality at an affordable priceExpertly made from premium materials$1,046.03
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-293Y-L-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes by Doug Thorley Headers®. Primary Tubing Diameter: 1.875". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes huge increases in...High quality at an affordable priceExpertly made from premium materials$1,088.90
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-344Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes by Doug Thorley Headers®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes huge increases in...High quality at an affordable priceExpertly made from premium materials$994.58
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-555Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-555Y-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.5". Collector Outlet Diameter: 2.25". Header Style: Long Tube. This complete header kit makes...High quality at an affordable priceExpertly made from premium materials$653.05
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-550Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-550Y-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.5". Collector Outlet Diameter: 2.25". Header Style: Long Tube. This complete header kit makes...High quality at an affordable priceExpertly made from premium materials$647.34
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-542Y-O-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Connector Pipes (THY-542Y-O-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.5". Collector Outlet Diameter: 2.25". Header Style: Long Tube. This complete header kit makes...High quality at an affordable priceExpertly made from premium materials$643.05
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with X-Pipe Connector Pipes (THY-291Y-L-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with X-Pipe Connector Pipes by Doug Thorley Headers®. Primary Tubing Diameter: 1.875". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes huge...High quality at an affordable priceExpertly made from premium materials$1,277.53
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Y-Pipes (THY-352Y-L-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Header Kit with Y-Pipes by Doug Thorley Headers®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 2.5". Header Style: Long Tube. This complete header kit makes huge increases in power...High quality at an affordable priceExpertly made from premium materials$1,173.21
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-375Y-S-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-375Y-S-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.5". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's...High quality at an affordable priceExpertly made from premium materials$798.81
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-376Y1-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-376Y1-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.5". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's...High quality at an affordable priceExpertly made from premium materials$971.72
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-322Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-322Y-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 3". Header Style: Long Tube. What better way to enhance your vehicle than a beautiful set of...High quality at an affordable priceExpertly made from premium materials$943.14
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-311Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Headers by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.5". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's headers are...High quality at an affordable priceExpertly made from premium materials$973.15
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-289Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Headers by Doug Thorley Headers®. Primary Tubing Diameter: 1.5". Collector Outlet Diameter: 2.5". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's headers are...High quality at an affordable priceExpertly made from premium materials$1,044.60
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-324Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-324Y-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 3". Header Style: Long Tube. What better way to enhance your vehicle than a beautiful set of...High quality at an affordable priceExpertly made from premium materials$890.27
- Doug Thorley Headers®Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-372Y-C)Steel Long Tube 4-2-1 Tri-Y Exhaust Headers (THY-372Y-C) by Doug Thorley Headers®. Primary Tubing Diameter: 1.625". Collector Outlet Diameter: 2.5". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's...High quality at an affordable priceExpertly made from premium materials$1,031.74
Since Doug Thorley Headers invented the Tri-Y header far back in 1958, it had been known as a pioneer in the automotive aftermarket. Now, with over 50 years of experience, the company continues to be driven by passion for premium quality and superior performance and manufacture 100% American-made headers and exhaust systems for a great number of applications. Built to reliably provide the greatest horsepower and torque, all Doug Thorley exhaust components are made from the finest materials with meticulous attention to detail.
As every vehicle is unique, the Doug Thorley Headers product line includes hundreds of top-notch products and applications to satisfy various customers’ requirements. Globally known for its Tri-Y header, the company currently offers a significantly upgraded version of this product built using up-to-the-date technologies to deliver both maximum low/mid range torque and ample horsepower, which is perfect for tow-rings, trucks, RVs and most street applications. For muscle car owners, Doug Thorley Headers provides WORX Series Headers.
All Doug Thorley LS swap headers are professionally tuned to ensure maximum possible power and efficiency. The company also manufactures Long Tube and Shortie headers. The first ones are designed to replace the original exhaust manifolds that come with long primary tubes in order to significantly increase exhaust flow, while reducing power robbing back pressure within the system. Doug Thorley Shortie Headers feature thick wall steel tubing, which ensures increased flow of exhaust gasses. These products have the factory mounting locations for emissions equipment, and that guarantees that the vehicle keeps being street legal. The product line of the company also includes cat-back and turbo-back exhaust systems built to deliver not only a satisfying rumble, but also more horsepower and torque compared to the OEM ones.