I tried with a plx wideband before I had a bung welded into the downpipe. It worked ok for a little while, but then started to get an o2 sensor heater code. I also tried to get closed loop enrichment under boost with a Split Second enricher device and could not get it to fool the ecu. Even stumped the techs at SS. The guy who put the Rotex in his NA could not get the Aem piggyback to simulate the narrowbands correctly either. There is something funky about the way this ecu uses the sensors......