I just got off the dyno yesteday and was a lil surprised. The first time I dyno'd my car, which was a few months ago, I was able to crank out 149.5 to the wheels with I/H/E and test pipe. This was done with tunning on the vafc. I had a air/fuel ratio of 13.9:1. Now yesterday I dynoed the first run and pulled out a 138 with the air fuel at 13.1:1. These were the same settings as before, but the only thing I changed on the car was the test pipe, I had a straight through one, now I have a resonated one. I am guessing this may have thrown off my air/ fuel ratio. So I leaned it 1 percent more all across the settings on the vafc and pulled a 139. Then I leaned it one more percent and I pulled a 152 with a air fuel ration of 13.5:1. Now my question is, why would this jump so much like that, and is that air/fuel ratio going to be ok?? TIA