Out of curiosity what are the cost differences

pittsburghracer said

I’m licensed but no physical is required. I’ve been asked to see it once in the last five years.

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unless they changed it, you can run down to 9 flat in IHRA without a physical.
In NHRA it’s required at 9.99 and faster. Of the tracks you seem to run at, Norwalk is the only NHRA track.
Bowling Green is too( I get down there once a year for Moparty) but that’s it, around these parts. I don’t race at Indy, all the rest are IHRA/ WDRA.