The way I have understood things, it is not recommended to use the existing O2 eliminators because they do not work properly. It will disable the O2 sensor, and it will keep the warning light from going on, BUT it will cause the ECU to fallback to a fixed map that is to rich for XT:s (during cruising conditions, which is when the ECU considers the O2 sensor values): the same thing that would happen if you just disconnect the O2 sensor.

Kev or anyone else, please correct me if I still don't understand things correctly.