3 systems to choose from. Our stock tri-y up-grade, long tube tri-y and long tube 4 into1. These headers are uniquely designed to split into two pieces for ease of fitment and the ability to change from one type of header to another. Developed exclusively for rsx-tuners by HyTech Exhaust. Made form 304 stainless steel, and TIG welded and purged for the absolute best RSX header that you can get.