Remember thatthe G-tech will be a little lower on the HP and TQ than a Dyno. You don't have wind resistance on the dyno. How modded is your car? The only chance I got to G-tech my car I put down like 230HP and 245TQ but she was very sick. Found out my compression was down between 85 and 110 psi per cylinder. I get her back next week and I should be approx 425HP (Stillen Stage 11). Lets see how accurate the G-tech is then!!!