I just got off the phone with the shop that is tuning my car. They said that i was running extremely lean (13.5). The car was fine before. Since i last had it dynoed, i bumped up the boost to 9psi (was 7) and added a test pipe and 3in exhaust. I'm told that the problem seems to be fuel pressure, they're adding fuel, it's just not helping. I was told that i need a better fuel pressure regulator that is also boost dependant. I have an aem that i can put on there. Do you guys think this is the problem? Anyone experience this? I trust what the shop says, but could it possibly be something else???