I don't know about the 2 ltr version but my 2.3 LPT from 1996 didn't have the 'business' end of an APC system ( the actual solenoid itself) but it does have all the wiring loom in place just to plug one in.
However, I'm pretty sure that just plugging a solenoid in will make no difference because the standard ECU is not programmed to control it. You would either have to :
1. Replace the ECU with one from a full pressure turbo car of the same period ( and be wary of Saabs VSS security system if fitted) & then buy an APC solenoid . You will then have a full pressure turbo car, which I think is about 200BHP as against the 170BHP of the 2.3 LPT.
or
2. Buy a tuning kit from Elkparts/ Maptun/ Abbott etc which will give you a reprogrammed ECU (& normally an APC solenoid & a free flow air filter too)which will increase the engine output up to 235BHP , or thereabouts, depending on which system/supplier you choose.
I chose the second option for my car and cannot speak highly enough of it. The cars performance is transformed & I still average over 30MPG.
Have a search under LPT upgrade & you should find more information.