TBH If a cop wants do defect you he can find a reason from factory. Let alone half the mods that cars have these days. Guess its just luck of the draw. When i had my N/A in NSW i had a pod filter, too low, and prob too loud and it still passed roadworthy and i made it 2 and a half years without getting defected just by being polite to cops.
In saying that i had a 45 minute argument with a cop because he said that the skyline was never made in an N/A and i had done a non engineered engine swap. I just told him he was an idiot and if i gave me the fine/defect ill see him in court lol.
Defecting is like 90% of the reason my car NEVER goes to civic, goes around where the RBT stations are south side and rarely crosses the border. i hate to think what they could go to town with at the moment on me defect wise in the GTR.
Hope it gets fixed for you Bratva.