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I thought I'd throw in my 2 cents.
I don't think that overheating these things will be a problem if you have enough cooling. Yes, an exhaust manifold can reach 800*F, but nobody every tries to cool the exhaust manifold. With these thermo-electric-generators you need to cool one side of them in order to generate electricity. By cooling them you also cool the exhaust pipe they are attached to. We're talking hundreds of degrees differences, maybe even cooling them with 100*F or cooler water. If you're cooling them with 100*F water it will be nearly imposible to even reach close to the 600*F overheat mark.
It sounds like you could cool them with engine coolant and then have the benefit that it warms up your engine more quickly too.
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