yeh at end of the day its all comes down to the mood of the guy pulling you over, they can still sticker you. The permit might or might not affect their decision. perhaps the permit makes it easier to get the yellow off? no need to convert everything to stock?
I have permits for atmo BOV, catch can, strut brace, suspension, pod, gauges, intercooler and piping
Didnt think it was possible to get permit for exhaust and ECU, maybe I'll give it a go next time.