• But you're still using the injectors in the ITBs I assume, so what's passing through the hoses is an air/fuel charge mixture? I've seen cases where that's been sufficient to degrade the silicone hoses over a long period of time.

  • No, like @mcmyk says, they've been blanked.

    Only air going into the cylinder head via throttle bodies and accompanying pipework and manifold.

    Only the MX5 injectors being used.

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