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re: Tamworth
I'll second this. They're a new track and are still controversial with the townsfolk so they're bending over backwards to be good neighbors. Every single bike is sound-tested before it's allowed on the track. This year was a little looser in that they'd give you a personal sound-based rev limit instead of just failing you outright but they have a meter on the straight so you'll still get bounced if you exceed the limit on the fly.
I got black-flagged in 2017 so I put in a db-killer over the winter which cut the noise and didn't cost me any power so I leave it in all the time now.