I'm no fan of the NIMBY types, and racetrack closures are frustrating as !%#!.
But also, no reasonable person needs to run straight pipes. It's not like plenty of categories don't' have a spec or inlet restrictor or something anyway. No reason there can't be a spec muffler that passes some uniform dB test. SCCA already has a max solo level of 100dB; IANAL, but if they made some uniform test (a la NIST or CARB) and level that passes at Laguna Seca and LRP, I think it would be easier to fight any additional noise ordnances that pop up. 100dB is too much, and some person holding a dB meter in a flag station isn't rigorous enough a measurement.
Basically, we could throw the book at the NIMBY types...if we had a book to throw.