i would drive mafless with 2,7 bar boost and the ecu have to know the correct boost.
Maximum in the ECU is 2550mBar. No matter what sensor you choose, it can never understand any higher boost.
Please reread the wiki and all of the various 5120 mbar threads.
Even worse, "mafless" makes no sense in ME7 since it has no in-manifold pressure sensor.