For my winter upgrades this year I had planned to install an EPAS from a Corolla/Prius, but ended up too busy with work and ran out of time (driving season is too short up here to miss any for nonessential mods!) So rather than cutting and welding on the steering column, I left it as-is and installed an electric power steering pump out of an MR2 pushing fluid to through the power rack. It required adding a PS reservoir of course. One of the other winter upgrades was to machine the rear legs on the front upper control arms a bit so I could get more positive caster. Very pleased with the results - the steering assist level is very moderate and with the 7 degrees of positive caster the on-center feel is very firm. Our 2011 Mustang GT is numb by comparison. Parking lots are no problem with the level of assist, and at 80mph freeway speeds it tracks like an arrow (And at much higher speeds on certain back roads too but I'm not sayin'). Feels like I could set the cruise and take a nap going across I-80 in Wyoming but that would probably be considered bad form.
Very simple to wire as well, just a relay off of the battery to a switch under the dash, and ground. It's a bit noisy but I installed it without any isolators that are probably used in OEM applications. Might play around with that. I'd have to do a little more research on the unit to find out of the MR2 pumps default to a high or low signal in the absence of a speed signal. PPM from my TKO is not right (12 pulses per rev, and the default for the MR2's I think is 4). But it's supposed to modulate the assist based on speed if you have the right signal on that wire....no need for an ECU.
Just another option for those who don't want to cut/weld on their steering shafts.
Attachment 108457