Personally, I can't see any reasonable logic for this argument... I've put pipes on just about every bike I've owned, usually while in the break-in period.Originally posted by AllBlack636
I say break the bike in with the OE or after market but as long as you break it in from the beginning with the same exhaust. That is what I was told by a friend that works at an after market shop. I put a Micron on mine when I had 2 miles on it and broke it in with it. You should be alright just put it on before you get over around 100 miles. You want the bike to breath the same way, not to change in the middle of brake in.