I've only gotten pulled over once (no speeding etc.), cop jumped out and started yelling about how he had better things to do. Somewhere in the yelling he mentioned my exhaust and whistling.
Sometime during his tirade another cruiser pulled up, and then he just sort of walked backwards to his car continuing to talk. Then he drove off.
I was confused so I looked at the other cop in the cruiser that just arrived and they looked as confused as I did, so we both left