Originally Posted by Mr Kleen
Might mount the O2 sensor far enough out of the exhaust gas stream to no trip the ECU? I know Subaru guys who have used spark plug anti-fouler collars to do just this. The collars screw into the O2 bung, then the O2 sensor screws into them. Not sure if this would work for us though.
+1 I know that some did same with B5 S4 Audi.
Though I'm not sure is there enough space for extenders.
I think it should work but could be same like with catted downpipes that sometimes they throw CEL sometimes CEL free randomly...