Generally speaking, the popo don't actually care. Loud exhaust has to be pretty freak'n loud for a cop to stop you for just a fix-it. The "fix-it" is usually just a tool... probable cause for a stop, or a substitute for a mover when you get pulled over. Unless the cop is working a BAR detail or something. Normally, If you are cool, he/she might ditch a moving violation and just write some chickenshit "fix-it". Cop gets a stub stat, you don't get a point, everyone is usually ok with it. On the other hand, I have seen someone get the crap written out themselves by being a dick during a stop...the mover, and a whole crap-ton of CS fix-it's. Rare. But usually starts with "You mind telling me why you stopped me!" before the cop can even say "good afternoon". I say all this knowing full well that cops rarely stop straight pipe Harley's. Kinda sucks if you ask me.