chuckd - best run on hypertech tune was at 33 psi. I decreased the tire pressure later in the day hoping for better traction. On the best mph stock tune I was at 28 psi ( more rolling resistance ) and the difference between tunes was 106.25-105.82 . Throttle response was better on the stock tune. Times were slower because I had more wheel spin on the stock tune runs. So even if hypertech gave me 6 hp or so...which I really dont believe, the car drove better on the stock tune. Plus I got my money back and may use it for uprev.
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