Look for sixdogs1 on youtube. He is currently in the rebuild of his system he is going with custom made tubes. I am sure its been done before him but that was the most recent I have seen of anyone doing them.
Hey OP maybe you could reach out to sixdogs on youtube and ask for some tips. He goes through his entire build process on at high level so that might give you so good tips. Good luck with the build if thats the route u go.
thanks! i sure will. seems very interesting
here is the video for Sixdogs1 - Operation Big Bang
http://www.youtube.com/user/sixdogs1#p/a/u/2/-l4mYVB9Eqg
yea thats what im looking for. i saw this a few years back in a different car and thought it would be cool. i just dont know how to calculate or tune it