Originally Posted by witestang

I have an 03 automatic. Last summer i ran it several times with only magnaflow mufflers, and a k+n filter added to the car, and it ran a 14.6 quarter mile, with 2.2 60ft times. Over the winter i added a 3:73 gear, accufab 70mm throttle body and plenum, underdrive pulley's, an off road x-pipe, subframe connectors, a sct custum tune. It dynoed 258 rwhp. Well i finally got to the track and i ran twice, it ran a 14.3 both times with 2.2 60ft times. The weather was cool and humid. A few week's later i ran on a dry cool, night. well i ran 1 pass at 14.3, and 1 at 14.5 and 4 passes at 14.6. With a 60ft of 2.2. I wasn't bogging down or spinning off the line it was lauching fine. My friend ran it twice and ran a 14.6 both times with a 2.2 60ft time. I'm pissed, I added that stuff and didin't really pick up anything at all the majority of the run's. Any idea's on what's wrong?