Do it yourself 3-1/2" X-style universal crossover kit. All tubes are CNC mandrel bent for optimal flow for all bends in this kit. Made from 304 stainless steel for maximum corrosion resistance. This kit includes 1) X-pipe, that is expanded on all four legs. These are TIG welded for strength and durability. It also includes 4) 45 degree Bends for width and length adjustment, it fits in 11" minimum channel width for use with this setup. 4) Clamps also included to tighten everything up. These kits come with a lifetime warranty and proudly made in the USA.