I've been happy with the torque pipe, but I have never tried the rev pipe. I wasn't willing to give up any bottom end. I have added the DF II reed cage set on high tension to get a few more rpm's on top and better throttle response. When I'm ready for a little more top end I'll probably get the RB carb mod. You'll probably need to consider where you ride, I'm going to be going to a H/S next month in West Virgina. And I know I'm going to spend the whole race in 1st and 2nd gear, so I really won't need anymore top end there. Just nice smooth power on all of those off camber rock and root infested trails.:)