Hmm, we have a similar regime in NZ, whereby more or less anything needs certification. There's limits for some things like power output - over 20% over original requires certification. And it's expensive, NZ$350 for a fews mods up to NZ$1200 for a scratch built car. Hi Lo's, negative camber brackets, widened steel rims etc all need certifying, and if you can't prove the quality of welds on a rim for example, it will never get certified.
You may get pulled by a cop, or you may not get a WoF. But the crucial thing is an accident. Even if it's not your fault, if your car is subsquently found to have a roll cage, 1380 motor, harnesses, wide steels wheels, small (<320mm I think) steering wheel, lights etc, and none of it has ever seen an engineer, you may be found liable and sued for a huge, bankrupting, amount. Not just a ticket, sued.
It's a pretty slim chance it would happen, but as soon as it did, you'd regret not keeping it legal. There are people who have been in similar situations, and because they disregarded the law, they've no possessions and a black mark. It's like driving without insurance and slamming into a Merc - you'd never be able to pay for it. Insurance companies never forget. They will lodge that claim against you and get their money, it's what they do.
Sorry to be a bit of a downer, but it's just the other side of the coin. You may not get found out, but what if you do and the situation turns nasty? Like a passenger in your car dies? It does happen, people get sued and it can f**k up your life.
Personally, I have one or two small mods which might need certifying, like a steering drop bracket, but will only get it certified when I have enough mods to make it worthwhile.
Obviously, everyone has a personal standard they live to. A loud exhaust might get you a ticket, but doesn't make the vehicle unsafe, A steering column made up from 'wobbler' connections from a socket set probably is... (A mod seen by a local vehicle certifier).
Your call.
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