If you feel up to it, you might be able to do some gear swapping between your current box and the ITR box. Anything you do to get a taller 5th gear will help freeway cruising economy--and how often are you really trying to accellerate hard in 5th gear anyway?
I have the radiator in my 1990 Si (D16A6 engine, 108 fire-breathin' HP!) completely blocked off. It has only been an actual problem once so far, when driving on the freeway in 70+ degree weather for 20 minutes or more. The rest of the time, it has helped speed my warm-up cycle, which is very very important now that I'm leaving my engine off more than it's on!!
My car does have the full-width radiator as well.
-soD
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