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Cops dont have decibel meters in their cars. But the rule of thumb that I got from a cop about stereos is if you can hear it over 50 feet its too loud. As for exhaust I think that you probably want to stay under the 100dB mark. Youll notice, especailly at night, how freakin loud your car is. I had a '79 that set off car alarms like mad. I once started it on the roof of a 10 story parking structure and set off a car alarm on the ground floor, the guy at the booth was laughing and told me I set it off as soon as I started my car.
-P.