I'm building a couple right now, if you still need a pipe in a month or so i'll build you a custom exhaust, i can make it however you want, with certain limitations, but i'll need a lot of dimensions. Actually i've got a really good idea, i'll build a foam one, send it to you, you cut it up to fit however you want, hot glue back together and ship it back to me. I might be able to do the whole thing for about 200 something, ten bucks an hour plus expenses, so depending on what metal is in the scrap bin, probably around 200. I havent built any yet, and i havent dynoed them so i dont know if they will work, but if the prototypes work out, i'll put up a post. trust me, i'll be pretty excited.