Thanks for the reply.
Ultimately, I would like to keep the car standard, however, the discontinuation of some of the parts
and the price of the M5 parts may be comparable to aftermarket...
Also, as technology has moved on after circa 20 years, the parts available now - Braking systems, suspension etc have advanced, that's why im tending to lean towards aftermarket 'upgrades'.
As for the Engine, I leave that well alone as I am more than happy with what it does.
I am based in Basel, Switzerland but still have links to the UK where I would probably get most of the work done as I have more established contacts their.
Has anyone done the Poly Bush upgrade on their Biturbo?