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They usually have a maximum number of days in a week or month that they can run 102 or 105dB days, the rest of the time it's 98dB. Another reason I prefer test days rather than track days - they usually run to MSA 105dB limits. And the FuryRacer only just scrapes by on 105dB tests thanks to a 13krpm red line.
Brommers
I don't fully understand why on some days it's allowed to drive on track with a higher decibel output, I would have thought a noise ceiling was in place so as not to unduly disturb those living nearby? Or is it some sort of brokered deal that you can play with the extra loud toys on Thursdays only?