Got the race pipe last night. The power seems about the same ,but it's not as loud as the hawk pipe. Which I was expecting, but didn't really want to believe. It does sound more "tuned". The raspy sound on de-acceleration and between shifts isn't there with the race pipe like with the hawk. It maybe in my head, but the bike seems to shift smoother, which I know, makes no sense, but it was the second thing I noticed besides the sound.