9 Second Club
In 105 degree temperature last May I had the car tuned after replacing the valve springs and porting the Throttle Body. Best figures were 420/367. These results were with cats and on the stock rear end. In August I had the 3.91s put in and the car was dyno'd in about 90-95 degree temperature. It made 415/362 for a net loss of 5 and 5. However, I am certain that the temperature being a good deal cooler helped. Today I dyno'd and tuned her after removing the cats which had issues due to railroad track encounters had suffered compression of the element. Temperature was 85-90. She did 430/372 for a net gain of 15/10. Tests were on the same dyno. I wouldn't claim 15/10 for removing the cats as the cooler air is bound to have some effect. I think the results do confirm that 8-12 rwhp and 5-10 rwtq are pretty doable.