yea....that wouldn't be the best autocross car.
if you want an n/a 12 second car, just swap in an h22, get some bolt-ons (cai/header/exaust+test pipe), strip the car down, get sticky tires/light rims, a nice hard suspesion, a nice tough clutch+flywheel, and learn to drive on a track....it's very different than on the street.