I know nothing about the area, but some cops can just be...well, not so nice. They always assume everyone with a "modified" car is about to race at every stop light. At least he didn't do anything, either way you would've won any case he would have tried but still the hassel of it all. I've been pulled over I believe two or three times telling me I have a loud exhaust. They never gave me a ticket and afterwards they would usually just tell me they just wanted to check me and make sure I wasn't DUI.