[strat61caster]

Could they? Absolutely.
Could you? Sure!
There are aftermarket companies that build magnetic ride suspensions for cars that came with them, if you had the money you could certainly commission a set for your car.

Would it be worth it? This will all be opinion based but my thoughts are no. As go away posted it would add at least a few thousand dollars to the car, you'd probably end up with a near $30k 86 with all the R&D costs associated with implementing it effectively with OE like reliability and at the end of the day I doubt it would net you very much performance benefit, you'd end up with a 'soft when commuting stiff when going down backroads' and the uncertainty of the longevity of magnetic ride, the expense of maintenance, and of course the initial cost.

I've heard, I think it was on this forum at least once and a few other places that magnetic ride control really isn't all that it's cracked up to be. The fluid used in the damper with magnetic fragments in it basically tears up the inside of the damper, wearing it out extremely fast compared to traditional fluids, this means that in order to maintain any sort of consistency the damper has to be built with loose tolerances and even then over time it will wear out quicker than a traditional damper. Maybe some advances will be made but right now it's a bit of a marketing gimmick, you can get more performance and comfort out of a well tuned traditional damper for less money than the magnetic ride, if you're smart you can get both.

If it were all magic we'd be seeing it in racecars all day long with raceteams talking about how well they can dial it in, but like I said, the Penske guy on the forum claims they will go out for a session, come back and dyno differently than before, they're not consistent and of no real advantage over traditional dampers at this time.