When I wrecked my car it was running better than ever by a long shot. It's just plain awesome what you can do with the stock ECM and the TurboTweak SD chip. I dyno'd 714 (29psi) last year and I honestly think it was over 800 at the wheels when I crashed. Of course I can't prove it, but there's a reason I don't want to sell this motor combination. It Works!