They'll fit. I run 285-30 Hoosier A6s square on my M coupe with stock wheels. I need a 5mm spacer in the back for wheel well clearance. The front fits fine.
Shorter tires are typically better for autocross. You get better acceleration because of the gearing advantage, and you lower the car. If you're in stock class, shorter tires are the only legal way to lower the car.
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