1. Don't make unnecessary eye contact with cops. They look for it, if you don't look at them it makes it harder for them to initiate any contact with you.
2. Your heavily modified car is always going to be a target, as are age, race, dress etc.
Driving with straight pipes is 100 times worse than driving while black. I wished cops here would pull more of these guys over, you realise it's extremely antisocial..?