The Pace half-width one is only good for about 16-18psi tops. Thats not far ahead of the standard cooler IMO. I don't think you could measure the miniscule amount of pressure drop you'd get with a GRS at 18psi and weighing that up against its great cooling ability, I know what wins.

GRS is ACE. I am now trying something else, but that doesn't mean that I don't think the GRS is the most effective off-the-shelf cooler available for the RST.

(Mine will be up for sale shortly )