That car was a quarter mile horse and it was probably ran hard. This was a bad buy as it looks as though there are alot of issues. The car was far from slightly modded. Boosting 3.3 is not normal. Stock boost levels should hover around 7-8 psi. You have either a boost leak or your turbos are shot. Are u hearing any turbo whine?
917-939-4980 CODING E and F Series New York Area