[jray3]

Yep, I've only seen electric assist, not pure steer-by-wire. There are some expensive aftermarket kits for electric assist, plus some good OEM salvage now available. I've spent a lot of time turning the electric racks of a Saturn VUE hybrid and the Mitsubishi i-MiEV. Both of those have different merits for a conversion. Then of course there's the old converter's technique of just spinning the hydraulic assist with a dedicated motor. I've driven those with a toggle switch to turn the boost on and off. It felt much better than expected, and boost was only needed during low speed maneuvers. Warning though, turn it on during the middle of a low speed maneuver, and the wheel could be wrenched out of your hands!