There was a guy on here that rigged up a butterfly valve exhaust a couple years ago. His name was Bogg or something and he posted a step by step and sound clips. He went to all that work and the general consensus was that it sounded like crap. Try searching "exhaust valve" and I'm sure his thread will pull up.
*edit* Found it.
http://986forum.com/forums/showthread.php?t=8684&page=3&highlight=exhaust+valve
Last edited by Adam; 02-24-2010 at 11:44 AM.
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