I do that sometimes in my small paseo 1.5L with an large audio system that has a mass of a little truck, i just get followed a bit and either get pulled over (i onyl had the car for 1 year and have been pulled over and checked more times that i can count, even if i removed my chrom spinners, it was used as a joke and provked rices to ride next to me and "audio duel" or rev their engine). but i asked a few of my police mates and they just say make up an excuse, common one is that im testing out my engine cause i heard some rattling and i wanna stop it. as long as you dont make too much noise whilst past 10 or 9pm (noise pollution, same thing as car audio, yes if you can hear it 10m away from your car and its pretty loud then you get noise pollution), shoot up smoke or endanger people's lives then its okay, accordign to 2 of my cop friends, but you could get something for endangering people's lives, its really depending of the cop you get. Like they say in my course at uni "criminology, making criminals better" and "It all depends on the cop's mood is depending on what route of the criminal justice system your going down"