Sema Data Co-op » Doug Thorley - Coming Soon!
For over 50 years, Doug Thorley Headers has been an innovator in the automotive aftermarket. Driven by a passion for performance and superior quality, we 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 we first invented the Tri-Y header in 1958, and we do it all on American soil.
Every vehicle model is unique, and our R&D team is constantly working to provide a diverse range of products and applications to meet our customers’ needs. Whether you’re hauling an RV, building up a street rod, or just looking to get a little more punch out of your Smart Car, Doug Thorley Headers has the product to maximize horsepower and torque for your application.Company Website »