Hi John,
The way the rules are is that the only class a "lightweight" Supra could enter is open class. If the car is stripped or has carbon panels (doors & guards) puts it straight into Open Class. I dont think I would want to run a 3.4L lightweight Supra on Street Tyres anyway would be rather scary I think as would a 400rwkw RB25 R33/R34. This is what we are hoping will get the owners of such vehicles to enter Open Class so they can run on Semi Slicks.
Cheers
-Nathan