These kits come complete with all the pipes you need to build a custom dual exhaust system in 2.25 in., 2.50 in., and 3.00 in. pipe diameters. These U-Fit Kits include the front adapter pipes, intermediate pipes, H-pipe assembly, over the axle pipes and your choice of optional tailpipe exits. Each piece has a slip-fit connection for easy assembly and is built from mandrel bent,16-gauge aluminized steel or 409S stainless steel.