Yes, its possible and very easy. But because you couldn't do the 30 or so seconds of research to find out for yourself I seriously doubt you'd be able to pull it off.
You'd need everything from an MSP that isn't the engine or tranny (ECU, manifolds, Turbo, downpipe, etc...). The stock P5 harness should work fine. Unless you find a well cared for stock setup for really cheap I'd just go with an aftermarket kit. If you wan't to make any sort of power in the future you're going to get rid of the ECU, Turbo, Intercooler, etc anyways.