My father owns an 850iA 1992, Black on Dove interior. The mods are listed below:

T-stars
JimC chips
Dinan tranny chip
about 5 hrs of work just to do ignition maintenance for 12 cyl., lol
taken to speeds I cannot advertise here
will need intake manifold gaskets replaced

Pre-ordered K-bars and tried to contact about them, never got a response and was ripped off.....fraud. So, I am looking into some Dinan sway bars.

I have balanced a quarter on its side while the engine started and ran; it was at the e34 meet 2 yrs ago.

I love the rear suspension geometry and how it handles the car. I hear you can use the e39 brake pads and grind a little off the ears to fit in the e31 single pot calipers.

See and talk to ya'll later.