Majority of guys running Gen IV ACRs are running Hoosiers ( R7s ), if they trailer their cars . But the disadvantage is you can’t really drive them to the track like the Pirelli Corsas. Imagine you can get Pirellis fairly easily in Great Britain?
I ran 275/345 Super Sport in the front because it’s what I already had, others are running 295/355 Pirelli and its what I would run if I were to buy tires today.
Pirelli Corsa, BFG Rival-S are likely the best street/track tire. The price is about the same on the two if comparing the Tire Rack price on BFG vs. VOA Pirelli Deal.
Lots of the Autocrossers are loving the BFG’s. Corsa’s have been recently improved.