I while ago Warren Heir Jr from Milwaukee told me about a racebike project he was doing with a bunch of school kids. He asked me to put together a "do it yourself" E-Fab exhaust kit for him and his students to put together. I built the cone and the merge collector, as well as the head flanges. Then I supplied several pre bent tubing sections, some straight sections, and the appropriate TIG welding rod. This is how it looks assembled.