I did that on my lower IC tube. I'd say its a nice helper. You can actually grab the lower ic tube without getting 2nd degree burns. Nice for changing plugs too, just gotta look out for them manifolds.
i would agree that it would definitley help the lower intercooler tube. however, i doubt it would make much of a difference on the upper intercooler tube. An intercooler fan and some wrap on the lower tube should really cool things down. If you pull out your intercooler......clean it out with mineral spirits.