No body kit, not to loud, suspension at legalish ride height, legal sized tyres on legal sized rims, being fully engineered "and" being 46 helps.
It was the same when I was young rolling in my LJ, if you were smart you could have lots of power ups as long as the outside looked tame, lots of V8s in LC,LJs, Cortinas, Centuras, 454s in HQs and so on, the man was defecting back then but if you were smart you could have big HP is a standard looking car, to many people want to be all "Fast and Furious" looking with body kits, loud exhausts and 10mm of the deck, LOL, IDIOTS.
And yes I have been pulled over and the police have been fine with my high mount and other bits and pieces under the engine bay once they see my engineers report and Im not acting like a tosser.
You only need big tyres/rims on the track, I dont care how mch power your car makes, if you need big tyres "because it cannot get any traction bro" you cannot and should not drive, if I can ride a worked GSXR1100 in the wet you can drive your car on legal tyres.
WHOOOOO, ending rant now.