I noticed in the Original thread you were interested in the little BMW for a BTCC style racing.
I did build one up to the specs for these cars, with some caviats. In order to fit it in I had to not go with the widest rear tires for it. But they are wider than the fronts. Fr 235 max width; Rr 245, max is 285 or 95. Race tires are fitted.
Full adjustable parts, full FM aero, race clutch, Cage, but only Sport weight redux, Drivetrain and flywheel are not full. It left enough PI to fit one power part on it to make it to B Class.
Speeds are not great right now. Really hurting on the uphill with rear grip. Having to feather the gas too much and losing time to you power on exit.
I don't have the times wrote down but I remember a 302.xxx on uphill, can't remember DH. But I think I knocked of around ten seconds with gravity.
The missing links are not race weight redux, and not full rear tire. But they are in the spirit. The way it feels, it needs one more size of rear tire. But if it does go through a rebuild, I think I need to look at if I can squeeze that full race weight in with an matching 235 rear tire and stock power. I don't think I can, but it might.