Yeah I still think the laws aren't that fair, I don't have a street registered car anymore, well might do now soonish ;) The main thing is they leave it up to the officer to decide what they class as excess noise or if you spun the wheels at the lights on purpose or not when it was raining.
I got told if you ever are planning on doing stupid driving on the street dress half decent, have the car looking respectable and then when you get pulled over for suspicion they won't think so much it was you? haha