Why cant I run my M52 in OBD2 configuration on my swap?

[PiercedE30]

Nice work etxxz!

[Funkmasta]

^^i see, i really wasnt counting much on emissions (FL). i have all 4 O2's, but no real desicion on exhaust/cats

You HAVE to run cats, or O2 simulators...

[etxxz]

if you wanna pass emission, get better gas mileage, closed/open loop or will the engine die. haven't made a desicion for either aftermarket cats or the much-considered stock m3 cats. just waiting for someone closeby to sell his exhaust....or wreck his car

[PiercedE30]

If you get a tune, just get them to go ahead and turn off the rear O2 sensors. Then you don't have to worry about the cats.