Doug Thorley Tri-Y Headers

The Tri-Y design yields maximum power from idle to 4500 RPM, while adhering to strict emissions standards. Engineered to be well-suited for Trucks, Tow-Rigs, and RV’s, power significantly increases in mid-range RPM’s, making this style exceptionally efficient at highway speeds. Fuel economy and low-end torque increase dramatically with the Tri-Y systems while reduced backpressure, lower engine heat and lessened weight are all added benefits of this design.