NHRA requires a 5x12 inch wind deflector that is metal or fire proof.
If I were to go with Lexan I would be essentially replacing the entire windshield- there's a 95% chance that I'll need to drive the car down to the competition vs. towing it (a 14-hour drive), so having just a small deflector wouldn't be a lot of fun and I'd almost certainly get pulled over if any cops noticed it.
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