I currently have a MAC SS catback and am very pleased with it. I'm considering the MAC O/R prochamber. Wanted to stay away from the raspy sound that the X pipes supposedly produce. Would this be a good combo? Also..with my catback I didn't necessarily see or expect any much in the SOTP power gains, but with the midpipe and getting rid of the cats..could I realistically expect more of an impact in HP with the midpipe than I did with the catback?