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i don't have a lot of info; what i know comes from googling rennlist. from what i read/infer, you look for a pump that does not weigh too much, does not draw too much current and that does not have a lot of complicated control (ie, some pumps take signals from the ecu so that they can react to vehicle speed, etc.). You want a pump that turns on only (ie, +12v and gnd). they typically draw 60 to 80 amps, so it want's it's own fuse. you want a relay or a switch in place so that it is only on when the ignition is on (some have an internal relay, and only require an input signal to activate). you need a reservoir (many pumps have this integral to the pump) and it should be large enough that it doesn't cavitate when max fluid is called for or overflow when idle. you need to sort out the specific fittings required to tie it in to your car - pressure from pump to steering, return from steering to reservoir, supply from reservoir to pump. you need to mount it somewhere (beside the battery?). porche motorsports can provide the parts for approx $2k, or there are many pumps on ebay for less than $200. apparently the porsche soln is actually a mercedes part ($700) but comes with the specific fittings, mounting hardware, etc.
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