They all (IPD, ARD etc) run a mac 3 way solenoid. I rigged my own one up for $60.00 delivered and it works perfectly. I could of done it cheaper but needed to rush it.
This is P2 anyway, I have no experience before the 01.
I can confirm that the MAC solenoids work well on p80 cars also.
Just keep in mind that the different MAC models have different port layouts, so beware when connecting them up. You can always blow through the valve to check which way it flows, but should flow from the compressor to the wastegate when no power is supplied. If you get it wrong you can kill your engine.
