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Well,
Over in the UK they have restricted noise to 105 dB at 1m from the exhaust. However F1 and other "international" classes, and vintage/historics are exempt. I believe an F3 produces far more than 70 dB but it may depend on the distance from the noise source. If its at the trackside rather than 1m from the exhaust I doubt that any (other than F1) cars would have a peoblem.
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