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the alternators fitted to the e30 have a sort of fanblade/waterwheel setup on the pulley driven by the belt-could that be modded to produce something similar to the hole solution you've suggested?
Essentially then you just need to get the steam to drive the alt.
Also what consideration haave you given to rusting to the exhaust?
Its a great idea, but what effect will the additional sleeve on drag under the car if it hangs lower than the rest of the exhaust, or do you envisage using the setup on the downpipe or manifold?
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