3 Bar MAP sensor
 

After my mapping session today it appears that if I am to up the boost at all I need a 3bar map sensor as it's unsafe to map over 1.6 bar on the OE sensor as you are too close to the sensors limits - does anybody know if there is an PnP sensor for a 2002 WRX or am I going to have to go for a generic sensor?

You would have to rescale your sensor calibration in the ECU regardless of which one you fit, if that's at all possible (not over familiar with your ECU).
Ginola deleted OE boost control and went ACVR as a work-around.

There's no issue with the ECU side although obviously it needs to be mapped in after fitting, I was hoping for a physical PnP sensor to avoid making the engine bay any more of a mess! All the ones I've found are 2004 onwards and I think look different in design to mine.