Originally Posted by Lannyl81

Ya know....there are days when I seem to leave my brain in the shower.

Just ignore my original posting above.

Yes there are four O2 sensors....if I had looked a bit higher-up on each cat I would have seen the pre-cat O2 sensors....oh bother!!

What I saw was that each OEM cat pipe has two sensor bung locations....I was seeing the lower one with a bolt in each one. Perhaps the G37 uses the lower sensor bung....

Oh bother!