Check with your track, and organization that your going to be racing at and with. Some have noise decibel restrictions, or time they are restricted.
My local track Portland International Raceway has a decibel limit of 105 dBA limit measured trackside. Though depending on race or time they allow varianced events include one event at 110 dB, two at 112 dB and one at 115 dB at trackside, and I believe during dragracing after 9pm 98 dB is the max.
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