Remember following a thread many moons ago on an e30 M3 which was having the
S85 V10 engine and running gear installed. Piper motorsports in the states built it.
They done a very neat job on the roll cage by integrating the uprights into the A and B
pillars, allowing all but the rear x brace of the cage to be hidden behind trim.
Heres a small bit about it, I think the full thread was somewhere on S14.net but
I can't get in to that website any more.
https://jalopnik.com/5349440/how-to-...-hp-v10-e30-m3