Multi class BTCC of the late 80's was great, even with the Cosworths dominating.
For the BTCC I'd introduce Group N like cars for upto 2000cc and above 2000cc with all drive forms allowed.
Ballast, restrictors and rev limiters could be used to balance the cars.
Keep things simple and allow manufactuers to race the cars they sell, whether it be a V6, 2l turbo, 1.8 hatchback, whatever.
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