OBX Catback Exhaust System 99-03 F150 Lightning 4.2L / 4.6L / 5.4L Value Added Direct Bolt On/ Weld On Set Up with Nut & Bolt Accessories are Included as shown Dyno Tested Track Proven Performance To Increase Horsepower And Torque With Great Throttle Response Precision CNC machined flanges with DUAL-TIG welded construction Backed by OBX Limited Lifetime warranty against manufacturer defects OBX Genuine Products Design and Quality of OBX U.S.A