This goes under the heading of cautionary tale!
I'm in the middle of changing P6's (photo's etc later as available). So one of the tasks has been to swop the skimmed to ET43 Vitesse wheels and 205/65 tyres onto the new steed (name of "Lucky" on account of a 777 reg no). All OK on the nsr but on the osr all a bit tight and just the faintest skim under adverse conditions. It turns out that the osr has had a repair to the D post (high quality and completely 100%) and the new metal isn't quite in the same place as the original. Grrrr!!! So we've had to skim a couple of the wheels down a couple more mm, which is the absolute maximum, even to a slight undercut. If that works then I'll do the fronts to match, if not, it's off down the body shop.
Bearing in mind this is the first time I've actually got to drive a P6 with these wheels and tyres, the results are somewhat unexpected. First off I would say the steering is lighter than on standard 185's!! That's very unexpected and has caused me to cancel any plans for a conversion from manual to power steering. Also the turn is dramatically improved even before I fit the uprated anti roll bar. I suspect these are both due to stiffer side walls thanks to the low profile? I've been running 28psi all round but haven't had the chance to experiment yet. Needless to say, grip is outstanding and now matches the stunning performance of the new brakes (Geen Stuff kevlar pads on a multigrooved vented disc with widened standard calipers at the front. Standard so far at the back).