Back in 2007 my buddy Jason and I both dyno'd on the same dyno, same day, same conditions. Both cars were about 3 months old with a couple thousand miles on each clock. He was RWD, me AWD and he was consistenly between 22 and 23 HP higher than my uncorrected numbers across the three pulls.
So I'd say approximately 20 hp is a good number to reference for this comparison.
Last edited by forza1976; 05-13-2011 at 02:54 PM.