i've not dynoed my car yet, but the power increase is definitely noticeable... sharper throttle, stronger pull, higher rev limiter. and remember, i have an auto!!! personally i think that the higher rev limiter is what got me ahead of the other guy. his car kept shifting just before mine. about 12hundred in upgrades if you're really interested. but remember this though. i get 25 mpg on the highway and 23.5 city. so i'm also making my money back. well,.... if gas prices don't keep kicking our asses that is!!!!