Volant Performance Exhaust Systems are the newest addition to the Volant Performance line. Volant Cat Back Exhausts are USA Made, loud, and built to last while adding performance. Volant Performance Exhaust Systems are mandrel bent and made of high quality stainless steel. Volant Exhausts outflow the factory exhaust significantly and look just as great as they perform thanks to a large stainless steel tip at the end. If you're looking for a better exhaust, Volant Cat Back Exhaust Systems look great, sound great, and get the job done. It really is that simple. The part number for this Volant Exhaust is 54905 and it fits 2011-2013 Chevy Silverado, GMC Sierra 5.3 V8 (Crew Cab/Short Bed and Extended Cab/Standard Bed 143.5" Wheel Base) models. It is 3" Diameter with a 4" Tip.