This 3 inch diameter Off Road Y-pipe is exclusively for use with PaceSetter Quik Trip Long Tube Headers for 2006-09 Chevy Trailblazer/GMC Envoy and Trailblazer SS with 2- and 4-wheel drive and 5.3L and 6.0L engines (header part #70-2276). The 16-gauge tubing is aluminized for longer life. The Off Road Y-pipe is designed to connect the long tube headers to the stock or stock replacement exhaust system. All clamps, necessary fasteners and instructions are included. Note: This Off Road Y-pipe will not work with other brands of long tube headers.