For Ford F-150 Catback Exhaust System 3" Tip Muffler - 4.6L 5.4L V8 Made of high quality T-304 stainless steel. TIG welded CNC machine flange for resistance against pressure and corrosion. Aggressive deep and smooth tone sound while ensures smooth exhaust gas flow. Dyno proven to instantly increases 15 to 25 horsepower or low end torque Fit 97-03 Ford F-150 Standard Cab and Extended Cab Models with 4.6L/ 5.4L V8 Engine ONLY