Widely spaced fins are not necessarily a good thing (probably bad) as that reduces the cooling effects. The thing is, though, that the back half gets MUCH less turbulence than the front half, so the back is just restricting airflow, not doing anything. Cathar is damned right about car blower noise though (have to shout, no motor noise, however), although that much pressure surprises me.
The heater core from a '79 Honda Civic is brass tubes with copper fins, I think, about 7"*7", and the barbs are already suited to half inch tubing. It's pretty good although expensive.
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