You guys are underestimating the bar and plate vs tube and fin design... Looks like all the cores tested in the referenced post were tube and fin.
Another thing, we all determined the Forged IC was a boat anchor like years ago. Might as well run stock Exige S part if you're thinking of the Forged IC (and it's like impossible to make power on the Exige S core). I have not seen the PA unit, but assumed the same about it as the forged based on its construction...
That said, the bar and plate unit that RLS sells is made by Bell. For those that don't know, bell (owned by Gerhard who designed coolers for F1 among ALMS and others. Quite the pedigree really) invested in the tools to make their own cores and not just make something work from china, or existing cores from the usual suppliers, etc like the others do.... the tube and fin design is FAR FAR inferior to the bar and plate (which the RLS cooler has for core) for cooling the charge.
-Phil