93 is a one year only ECU... It's the only 1st gen car with the "2nd gen" engine... A 91-92 ECU is a direct swap. All the wires and connectors are exactly the same. And being as you have already converted to the 91-92 CAS, you would no longer have to deal with the timing offset issue we previously discussed. The ECU part# you need is MD159966. That is by far the most common and highest production number ECU made for turbo cars, so it should be one of the easier ones to find. Just be aware that it is a high failure rate item, and you want to be an informed buyer, and not buy something that has leaking capacitors or board damage.