If the FP has a cat all you have to do is swap off e85 and you'll be STX legal. E85 and/or no catalytic converters at all puts you into CSP or SM, both classes allow non-street tires (Hoosier A7) so you won't be competitive with Bridgestones but that won't bother anyone.
Per 3.6 you can only run E85 in Street or Street Touring if the car is designed for it:
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3.6.A Fuels comprised of more than 15% ethanol may only be used when specified by the manufacturer (e.g., in the owner’s manual for flex-fuel vehicles).
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CSP should be slower than SM, but just head out and have fun anyway.
