unplug the o2 to the exhaust????? that's resolve my problem at 4000 and 5000rpm and stop the oem ecu correct the fuel map??? and unplug the o2 help me to stop max the maf ??because on the dyno the guy make a run on the dyno the air/fuel in boost is 11.5 and it's bug at 5000rpm . i make a another run the air/fuel in boost is 16. at each run the air/fuel change. that's the oem ecu make this???