I may get bashed for having Trinity pipes from what it sounds like but, I've had three different sets of pipes on mine and I can honestly say that the Trinity's feel to pull much harder and higher in the rpm range. I've had T5's, T6's, and now the Trinity's. When I first put these pipes on I took it out for a ride. I thought I was in sixth gear topped out, but come to find out I was just in fifth. I couldn't believe how long and hard they pulled. Just my opinion. Hell try the 30 days, borrow a buddies pipes feel the difference, then keep them or send them back.