I've been pulled over twice since I've had the car engineered, the first time the police asked me to pop the bonnet and I said "no problems sir, I'll just get my engineering certificate out the glove box for you" he had a look and said no problems, the second time they sent me around the corner to the mobile inspection station where the RTA guys were, they checked my cert, measured my ride height, tyres, lights and said no problems.
My car looks fairly stock from the outside but with aftermarket everything under the bonnet and under the car, inside the car is a half cage, harnesses, R34 GTR seats, fire extinguisher, first aid kit.
The rims were R34 GTT rims (now with 33 GTR rims) with the Nissan logo which makes the look standard, but it all covered in the cert.
I keep my cert with my CAMS licence, rego paper and insurance paperwork, which helps explain some of the mods.
Though I'm also 46 yrs old which keeps me out of the "stupid kid" demographics,and I am also always polite and answer all questions or requests with a smile, initially when pulled over I always say Gday and ask them how their day is.
I can understand why these inspections are needed to remove unsafe cars from the road, and I agree that imports are picked on, why, they are easy targets, but let's be honest, you can have your car legal and still have fun, albeit with some undue attention, do it right and the hassles are greatly reduced, do it wrong and pay for your mistakes.
Old man tip
No 1: don't have your car low with big rims, loud, or outlandish body kits.
No 2: get your mods engineered.
No 3: be polite always, the police are just doing a job they have been told to do.
No 4: don't give them reasons to pull you over, ensure all your lights work, and don't break the road laws.