you know you drive a GP when you go to sell it but then relise that you have more in aftermarket parts than the car is worth.
along the same lines
you know you drive a GP when you could demod your car and buy 2 more gtp's.
you know you drive a GP when someone ask's you how boost you are pushing and you say every bar.
you know you drive a GP when you look at buying another car and wont get one b/c its slower than your GP