Hmmm did u have major traction issues? With my accelerometer i consistantly get 4.5s to 60mph with my two mods in quiet industrial areas which are obviously not ideal compared to the track. With your pb 1/4 u should easily be doing 4.5s? I used my accelerometer at the track and was off by 0.15 of the track ET time. I think low 4s with your mods for sure