maybe, but it may well be running very lean, as the 3 bar map sensor will be telling the ecu that at 1 bar actual boost, the ecu will only be seeing 0.8 bar and fuelling accordingly, you only need to run lean for a couple of seconds and pop goes the engine

really, u'd be better off putting the 2.5 bar map sensor back on and it overfuel a bit until u get it stg 3'd