The vast majority of cars don't use copper and aluminium mixed together in the same coolant loop though. Most cars are using cast iron or steel water-paths, aluminium radiators and aluminium other bits and pieces, all of which are significantly closer to each other on the galvanic reactivity scale than copper and aluminium. Iron/steel/aluminium are close enough to only require fairly minimal amounts of protection.
Is there any chance of getting the pump bodies being made out of polycarbonate? 'twould be a very sexy thing to have a clear pump for the modding community with some LED holes in it. The pumps would sell by the thousands.
Alternately simply getting the pump bodies made out of Noryl?
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