Update:
Swap bank1 and 2 MAF = no fix
Pulled injectors and swap bank 1 to bank 2 = no fix
No tested bank 1 exhaust side but didn't see any leaks at the test-header flange or header-block flange
swapped the upstream o2 sensor but haven't started up the car to check.
not sure what else I can do after this.
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RHM 75mm TB & ported up/low mani., 3" intakes/velocity stack, Z1 Headers, Motordyne ART pipes, HBP 3.5" exhaust, Tein MonoSport, SPL F/R arms, endlinks, and tie rods , Eibach sways, Z1 rotors F/R, diff bush., subframe collar, Bell Raceworks diff brace
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