yeah theres a certain point i think...
if you saw some lancer or hyundai with a zorst, you would probably give them a bit of shit for having that car, then trying to make it more powerful (if you were a cop), but a skyline, which already has the power, and an aftermarket exhaust, kinda makes you think that the original amount of power wasn't enough for whatever purpose you wanted it for. Which is, assumably, driving it on public roads...
either way, only time i have ever been pulled over in my skyline (stock zorst) was when they thought i was part of an armed robbery... apparently they thought it was a clubspec WRX... in their defence, both were white... what a day to drive that car to work