I'm definitely sure you can use a turbo or a swapped engine in certain SCCA classes. For one, Adam Hutchinson does Solo I with a turbo SOHC KA. For another, at my first Solo II event, there was an Impreza 2.5 Wagon with a BIG turbo in it. Finally, the class I'm planning on competing in at the next event is SM with a turbocharged KA24DE. From my very limited understanding, SCCA will place you in Street Mod or Street Prepared for a swapped engine.
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