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Having self adhesive aluminum foil close to the red hot turbo it will melt the adhesive. Also if you are getting oil in this area, you are in trouble already. I agree fiberfax is brittle, but they also have other insulators that will work.
Given that the primary goal is reflecting radiated heat (rather than "real" thermal insulation) what's wrong with a coat or two of shiny silver paint? It's not as good as polished aluminum but it's decent, and high on the reflective scale. Sherwin Williams (and others) sells a product called "Silver-Brite" that is marketed as "heat reflective" and "dry heat resistant to 700degF". I haven't tested its adherence to epoxy so it might need a primer coat to help it stick better (it's designed for metal) but that's not a painful step. In any event, it would sure be a lot easier to apply than either foil OR fiberfrax, especially to an oddly-shaped cowl.
Unless real thermal insulation properties are necesary?
Regards,
Chad
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