Wouldn't the new Steering Rack (I assume you're going to throw a Z3 Rack in), Bump you into SM Class?
And completely 100% Agreed on the statement ///Ms get screwed over in SCCA Rulings. M3s have to go against boosted AWD Evos and WRXs. My M can only be placed in AS or BSP...which both require R-Compound Tires to run competitively. It "Should" be in a STR class but SCCA didn't want that.
Hopefully soon (aka next season) Ms and other cars get a new class in ST.