I just bought a SS exhaust at a resonable price (second hand cat back). But im not sure what kind it is. The guy that sold it thought it was scorpion, but im starting to think its magnex. The back box is oval and sit horixintally (ie thin part of the oval from top to bottom, wide part side to side). Its 4 inches i think. It looks like the magnex on my other willy, but i dont think magnex exhausts are marked, unless you put the sticker on them. I have some pics but i cant get em on ill see if someone will post em for me. Cheers.