I have a 01 cbr929 with a acropovic pipe. Between 2000 and 6000RPM there is a loud rattle type noise under load.I cant hear the noise just by reving the engine but when im driving its always there. Carter honda said this was normal and it is not the cct making the noise,It is just normal for this bike they said. Does any body with a 929 have this same noise or should I take the bike somwhere else to get checked out. I just bought the bike and it has 2000KM.