He is right though. First dude I took my car to for a wof went fine tooth comb on it, apart from the many many other issues, one was it needs a cert for the 1600cc as it deffiantly wasn't a 1200 and more.
Also @scooters heaps of people run 2-3inch beams without a cert, unless you know, most get away with it. The only really narrow car I've see in nz was a white bug on BRMs, pretty sure it was certed, anyway doesn't really answer your question but good to sharn.
I find with the 63, ground clearance is more of a issue, I've got a stock width beam and no drop spindles, and the beam is about 90mm off the deck. If i go over the speed bumps at work any faster than a crawl, the back of my front fenders get smashed, I would like to drop it one more inch.