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 70-2265). If you are not using Pacesetter Long Tube Headers, this part will not fit. The part number for this item is 82-171 and it fits 2006-2009 Chevy Trailblazer / GMC Envoy, Trailblazer 5.3 and 6.0 models with Pacesetter 70-2276 LONG TUBE Headers.