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Hey stubble,
I'm new to the Z4, but not to AX. Like you i'm thinking of staying in SCCA's AS category.
2010 SCCA rulebook seem's to infer any DOT legal tyre is allowed, so long as it's on stock sized rim's.
Offset can be upto 0.25inch from stock.
Alignment depends on driving style & comfort level. 0 toe in front should give better turn-in over a stock setup. Upto 0.25 toe out in front will turn in even better but it'll be frisky for the daily drive.
Exhaust is free aft of the cat's.
IMO & I've got my flame suit ON. Improvements List:
1. You, the loose nut behind the wheel :- )
2. Tyres.
3. Alignment.
4. Suspension.
5. ARB's.
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