05 450yz ( Stock jetting, lil above sea level ) Just looking for imput on ppl that might have done just a slip on upgrade. Did you need to change your jetting at all? I am happy to hear my decel popping sound is gone. I had figured there was a leak in my exhaust *took a nasty fall and bent it up, must of missed a crack when I patched it up using JB Weld* I would read the plug but damn if it inst a pain in the ass to do quickly. Thanks for the responses ahead of time.