Pacesetter Performance Y Pipes improve exhaust flow, resulting in increased horsepower and torque, eliminating a bottleneck in the exhaust system. Made in the USA! This item is used in conjunction with the Pacesetter Long Tube Headers (part 70-2267 72C2269 70-2269 or 72C2269). If you are not using Pacesetter Long Tube Headers, this part will not fit. The part number for this item is 82-1177 and it fits 2007-2013 Chevy Silverado / Sierra 4.8 and 5.3 and 6.2 models with Pacesetter 70-2267 LONG TUBE Headers.