Jha and HarcPro (along with HRC), have made pressurized airboxes for NSR, RS, etc. so it is possible. General rule is +2 on main jets but this should be confirmed with experimentation. I used an EGT (exhaust gas temperature) gauge when setting up my Jha MC28 system. I did not use the supplied fuel tank/air box regulator but instead made a switch/solenoid using a front brake pressure pressure switch.

Scott