DynoMax Performance’s VT Exhaust System for the 2011-12 Ford F-150 pickups is a cat-back performance system that delivers a drone-free and throaty exhaust tone. The exhaust is constructed of 3-inch mandrel bent piping and features a 12-inch-long slant-cut single walled tip. The heart of the system is the VT muffler that controls interior drone, using a precisely calibrated patented internal valve, which redirects the exhaust flow during cruising conditions to limit unwanted drone. The kit comes with all necessary hangers, clamps and hardware. Fits extended cab short bed and crew cab short bed Ford F-150 models. DynoMax Performance Exhaust: (734) 384-7806, Online Information.