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littlefarny,
A self contained cooling system, as suggested by Au Engle, would add a lot of weight. You could limit that by not recompressing the refridgerant in a total loss system, CO2 or freon (aren't those banned now?) that expands into the atmosphere to cool, but why not use something to do two jobs? (The Lesson According to St.Colin of Chapman).
Fuel needs to vapourise in the intake tract, so use the fuel passing to the injectors to cool the EGR gas. If it's under high pressure, the fuel won't vapourise before the injector, but will do so quicker when it is injected as it will be hotter. The total heat passing through the inlet will be the same, but applied more effectively.
John
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