I don't know, its tough to tell. like I said, I've definitely stopped spiking as high as I used to, which actually makes me feel a little better about raising the boost. the other day it was raining and I pegged the gas in 3rd and lost all traction, which has never happened before. I did put the turbo inlet on at the same time, so who knows what happened. I won't know until I go to the track again and run it. I refuse to guess at the power difference with my "butt dyno." the only thing that I do notice is that it is building boost a little slower, doesn't spike as high, and the charge temps appear to be slightly lower according to my dash hawk. We'll know the results next week hopefully!