'Hey Champ
Look a few things that help is no.1 make sure your not on your p's . Secondly modify your car cleanly, ie I drive a 10sec gtr now its loud and yes I may get pulled over but I do what I can not to. Ie I drive sensible, never go to chapel street, knox, princess or anywhere that will attract attention that I dont need, try not to drive it at night or late, ummm try not to drive it much lol. Yeah its a hard one the only thing a cop can see from the outside for me is my te37s and the lowered stance from the coilovers plus the aftermarket fmic. But nothing else so overall it looks fairly stock, so thats your best bet. The rest you can only hope and pray.
CHeers
Ray