OOOHHH MYYYY GOD! I just installed this exhaust with the cat delete on my 2011 R1 about a week ago and they sound AMAZING! The bike sounds like a beast. There is a huge difference in power as well or at least it feels like there is. Throttle response feels a lot smoother as well. I'm constantly catching people staring at the bike in admiration when I give it a few revs at a stop light. I've had numerous people pull up next to me and tell me it sounds "BAD A%#". If you are thinking of getting these exhaust take my word for it and GET THEM!!!!
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This pipe is much better then the stock pipe on my 2005 honda cbr1000rr. It's loud but not to loud I could easily do a multiple hour ride with this pipe without getting a headache. It has a nice deep tone all the time.