Aluminum is also easier to work with. The performance increase from airflow does not level off for a long, long time. Bill Adams has repeatedly proven that. 1-2C is possible (maybe even easily) with a big heater core and 4 Delta 38's, let's say. Now, Volkswagen heater cores seem to be the way to go. I saw a picture of one once, and, well,

The fin density was so great that it looked solid...
http://www.partsamerica.com/PartDeta...pe=524&PTSet=B Too bad this is a shitty image.
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I bet that is with a compunurse too?
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+/-1C isn't too bad for rough numbers like this...