yeah but if you actually read through half of the rules and regulations, HALF of the non-modified cars can be defected too.
some of the rules and guidelines are so vague and stupid it really does leave too much interpretation up to the enforcer, which in turn means there is far more room for prejudice and stereotyping being the reason someone is pulled over and not because there car is obviously a danger/illegal.
I got pulled over driving my full sick VL sedan ages ago... no where near legal... too low, tow bar covered the licence, tyres were worn, rear lights didnt work (it was night when i was pulled over), leaked oil, too loud, illegal tint etc etc... you know what they said, just make sure when i get home i take the towbar off cause if i go through a speedcamera they cant tell what the plate is... so not only did they let me off they then told me how to avoid speeding tickets lol
If i was in a stock skyline with even just rims and a cheap catback they would have gone over the car with a fine tooth comb and probably would have found enough to defect me and receive an EPA letter in a week or 2. And the skyline would be a far safer on the road. So its never going to get any better so no matter what happens your just going to have to put up with it if you drive a modified import.