WMichaels,
I've been reading the scca rules again.
We know that Stock Crossfire is DS.
Beyond stock looks like SM2 (street modified, 2 seater), maybe not DSP (D street prepared). or maybe both...depending on the types of mods.

let's suppose:
slotted rotors
chipped ecu
lowering springs
diff size wheels

What do you think of my interpretation?