I have been toying with this for awhile now. The worst part of the whole deal would be the following things:
Adding the piping
Adding the wiring (the whole harness is different so far as I can tell)
Edit: To clarify, I mean the wire to the actuator unit, the relay box, the ecu, and the speed sensors. If you have a donor car this would probably be as simple as a removal of the dash and main engine bay harness, replacing it with the for-abs one, but remember if the donor is a 92 the wiring will be different because the cruise and etc are relocated with dual bags) so probably custom wiring work
Adding the sensor rotors, which would require R&R of the wheel bearings and of course their replacement as they will be destroyed in the removal.
I HATE that I have one of the very few made without ABS.
