I spoke to three shops here in Denver a few years ago. According to them the tanks aren't thick enough to do anything with. I could have a double tube copper core built with the same tanks, but it wouldn't be any more efficient - in fact, it'd probably be worse. It's a 1.375" (or so) core and there's barely 1/4" extra space on the tanks front/back. I don't see any way to add a second row to the factory tanks....

Talked to Griffin a bit ago. Looking at their 2 row/3.25" core all aluminum radiator. They don't have a template for the Sport (of course) so I'll send them one of the stock radiators for a template.

Edward