stainless, copper, aluminum, copper, stainless. Yeah thats right i made my own copper exhaust gaskets. It only took me about 5 hours of layout, cutting, shaping, more shaping, buffing, reshaping and more buffing to come. stainless exhaust tips to follow. Oh and the aluminum peice in the middle mounts the two pipes to the frame. yeah the copper gaskets and aluminum parts are one piece holding the pipes together. if you steal this idea i will know and i will smash you bike apart with a hammer. Naw im just fuckin with you, i bet someone else already did this before me. I just made it look fuckin sweet.