528e is a former attempt at a LeMons car, so it has no carpet, half the dash missing, and a full cage. The car itself is mostly stock and running on all-seasons I think. They really had no choice since it was gutted when they got it.
Mine is mostly stock, stock engine, only "performance" mods are a 325i rear suspension/brake swap (hardly a performance mod since all other e30s have discs back there except my early 318) and a gutted cat (since it disintegrated), and old rally tires. No carpet, no backseat. The lack of carpet put me in MR from the start, so I just do whatever I want to it. It's getting an M42 swap this winter. So once that is done it will basically be a stock "newer" 318i, lol.... Any weight reduction I've done (broken AC delete, carpet delete, etc) is pretty much offset by the rollbar weight.
Stuart's 318is is almost completely stock with snow tires, but I think he ripped out the carpet....so MR again. Or maybe he still has carpet so he's PR. That car has run in both classes this year.
Jason and Pat's car is stock with snow tires....hell it even has an open diff for the moment. MR because no carpet...
Scott's car runs in SR (2 drivers) and PR (2 drivers). IT's stock with snow tires, and significant weight reduction (e.g. lots of rusted-out areas!!!). Runs full interior.
Jesse is a newbie but from what I've seen his is just a stock daily-driver type with some old snow tires.
In short, none of these cars are truly "modified" to any significant performance extent. Nor, for that matter, is Shawn's RX-7. I think it's stock too with just rally tires and some carpet missing. Not sure about the MR2's....the red one is a Camry V6 swapped but wasn't that fast last time out IIRC. No idea about the white one.
yeah, long-winded answer. It's a boring tuesday night