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mcmyk-
Indeed. I know GSXR ITBs have injectors in the ITBs, but I don't know enough about MX5s to know whether or not there's also the possibility of having injectors further up the inlet tract. Normally if you've fitted ITBs you'd use the injectors in the ITBs but it's possible the injector bungs on the ITBs here have been plugged.
Brommers
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.