I de-powered the rack in my 240SX after it blew up first session at a DE, and with a 13" smaller-than-stock steering wheel, it was pretty rough. (Stock is about 14" dia.) Shortly after that, I bought a 15" wheel from Longacre and the steering is MUCHO better.

I now have the feel of a manual rack and I have the drivability of power steering.

I've spent 4+ hours a day on track in and my shoulders were sore at the end but not falling off or anything. (My neck was more sore than anything).

Overall steering effort is only slightly higher than stock, but I can still drive tight tracks with one hand on the wheel and do 3-pt turns in the driveway without too much trouble.