race competent ABS systems. It seems to me a reasonable approach for older non-abs cars is to allow brake upgrades. Something like any single piece rotor with any 4 piston caliper, so long as it fits inside a 17" wheel, for the front. Upgrade to disk for the rear, if drum.
Oh boy. I better get a credit card with a much higher limit.

FWIW, on my previous ITB car there would have been some benefit to have fit it with rear drum brakes based on some pretty credible testing using a very similar platform (Prelude / Accord).