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Dramatic_Hammer-
No idea, just talking but I think in open cars wind noise is a factor as your head in in the air stream.
Proper race or rally cars with no sound deadening or material to stop vibration noise are loud. Like vans with or without headling, those without headling just amplify the sound as the sound bounces off the hard surface.
lynx
Loud pipes save lives...
But there is a reason that older Racing drivers are deaf or very hard of hearing.
Is it engine, induction or exhaust noise that causes the damage or wind noise?