You should have hole on your dump pipe for the O2 sensor. My wideband has been fitted after the cat convertor.
Yeah the stock WRX one has the O2 sensor in it. But is that the only O2 sensor in the 99 WRX system? Not sure what the other bungs are meant to be for?
So the best place to put a wideband in after the cat? I think I remember hearing somewhere that was the place for the best reading.
Does anyone know if the place in NZ called Scarles is still in operation? I ordered some stuff from them and didnt get any thing from them saying they have sent them, or got a reply from my emails. The website appears to be down also......