Sorry if this was covered before( did a search but didn't find anything specific).
I just recieved the new Hyper Rev " New Impreza STi Perfect Guide", and noticed a shot of a factory up pipe with the cat in it that had a O2 sensor right between the cat and the turbo(
), obviously making it difficult to simply throw in a "test pipe" for those who desired to do so.
I was curious if any of you that crawled under the Impreza here in the US noticed the same O2 sensor( can't see why we wouldn't get one).