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He was telling me about some newer technology where they are dimpling the tubes which leads to better cooling by breaking up the flow resulting much better cooling, particularly in high performance applications.

My snake oil alarm is going off. I'm not saying it doesn't work, but adding turbulence would, if anything, lead to greater pressure. Not much in this low-pressure application, of course, but still. It might cool the water better over stock by keeping it in the radiator longer....because it's moving through the cooling system slower.

The ways radiators cool better are by being bigger and having more more water exposed to more surface area (and of course, by moving more air acorss it). I'm not understanding this one, unless dimpling is what they do for more surface area.

When you talk to the guy, get the company name so we can web search it. If it was a choice of restriction, I'd rather have more of the skinny passages that water flows through, as that would increase water-to-metal (to air) surface contact.