I'd also suggest REMOVING the muffler [ not that loud without one] and just see what happens.. My turbo went thru 3 owners with no boost... took off muffler and BANG! Has a straight-thru Glasspack on it now. Matt Nall Charleston, Oregon http://tinyurl.com/The-Corvair-Patio http://tinyurl.com/Matts-Tech-Pages