• Just how noisy is a 911 on ITB’s? I should probably establish that before making any further decisions on that front.

  • In my experience of ITBs, pretty noisy if you're giving it the beans, not so noisy if you're just cruising. If you're concerned about it, just stick some extra soundproofing on the rear bulkhead inside the cabin.

  • In my experience of ITBs, pretty noisy if you're giving it the beans, not so noisy if you're just cruising. If you're concerned about it, just stick some extra soundproofing on the rear bulkhead inside the cabin

    I don't have a roof in the conventional sense, so share the same environment as the engine in some ways, hence my question.

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