I had a H/C package installed over the winter with a dyno tune of 451 RWHP with 42 degree temp. Corrected was 435 RWHP. I just got back from the track and ran a 11.60 @ 120.7 mph. I am also running stock 3.42 gears. Does this mph equate to the RWHP. Since the dyno tune, 6 degrees of timing was pulled out to prevent the car from detonating at low rpm while cruising on the highway. The compression ratio is 11.2 to 1. I am thinking of taking the car back to get it checked out on the dyno. I was told that the car should be in the 124mph range. My air/fuel ratio at 5000 rpm is 12.5 and at 6300rpm, its 12.9. Would going with 3.90 gears change the mph? It seems like I am in 4th gear only for a short period of time when I cross the line. I didn't look at teh rmp, I would guess and say around 5500rpm when I cross the line. Any input would be much apprecitated.