The MAP sensor is labelled as a Pressure Sensor B28. If that's right, then it's a 3-wire sensor as @Dave2302 says. The colour codes differ slightly from his description though so do double-check your colour codes!! Also there looks to be another pressure sensor on the car too - the Altitude Sensor, B18.
Concentrating on B28 (for an 111.983 engine):
Red / Yellow = + 5V relative to ECU sensor earth (pin 3.30 on N3/10 to pin 3.49)
Yellow / Black = ECU Sensor Earth (pin 3.49)
Brown / Black = Pressure Signal (pin 3.36)
With ignition on you should measure > 3.5 V and with the engine at idle < 2 V on pin 3.36 at > 300 mBar
I don't think he need to fool the Barometric Sensor Ckt, just MAP as he is running extra Boost
Personally I don't like 'Tom' foolery circuits, if this were a V6 or V8 Kompressor I would switch off the Over-boost monitor in the ME
However as said, I do not know if that is even possible on a 4 Cylinder ECU, would certainly need SDS Developer.