I dont have an exact answer on that.Basically the engine is a 2.0L engine,there were cars with close to the same size engine,and bigger in his class.But since hsi car was a rotary,they added more rules just for the rotarys.

Anyways,when they banned his car,he came back a year later 13B n/a running 1 sec faster,nowe into the 9s.. all motor.. stock chassis.. stock wheel wells,and the car is like 2200 lbs.I got pics of that floating around in my comp.