These were better than what i thought they would be. I have a 2018 R1 with a yoshi alpha series slip on, titanium midpipe. My ECU has been flashed and have a PC5 with autotune as well as a K&N filter. The backfire was crazy when letting off the throttle to either shift or just slow down. I wasnt sure if these would work in eliminating the backfire, but all sites said it was a must have. Well....they definitely worked! No more backfire at any points in shifting or slowing down. The installation was super easy if you have any mechanic experience level. The video that Brian does on the install is phenominal and a great step by step if you have no mechanical experience. I would recommend getting these for sure!