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If you plan to mod your car, just run open class and don't worry about where you place. Have fun first, learn the car, don't worry about classification until you are ready to get seriously competitive.
Basically, mod away, and do what you want for the car for now. It takes years to get good enough to be competitive in D-street and probably another couple years before you will be good enough to be winning in STR. Also remember than many autocross events have sound decibel limits, as well as some race tracks. Removing catalytic converters and resonators may put you over the sound limits, so just be aware of that. Normally you will get 2 runs and if you can't physically modify the exhaust right there at the event, either downturn tip(s) or packing steel wool into the exhaust tip(s) then you will be told you cannot compete any further. Most will offer you a refund or at least a partial refund for the entry fee.
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