I've heard those Allisons in person. They've been used, in the past for racing and now for vintage, "Thunderboats". I don't think I've ever heard anything louder. The thunder from a nearby lightning strike maybe (probably where the name came from, durrr), but that's just for an instant. These boats were continuously loud, really fucking dangerously harmfully loud. Pure awesome.
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Be Just and Fear Not.
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