I couldnt figure a title, but here we go. having the below noted mods to the bike, I get slight carbon build up on me left muffler tip only. The right is clean as ever, but the left tip has alot of carbon on it. I was told by a tech its nothing and not to worry, but not being a mechanic, I cant really say, BUT it appears to be wrong!! My other bikes have never done that, so I dont see why it should be now.