"DTH" Doug Thorley Headers

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.