3.0 before Cat, What # is after Cat??

[cab83_750]

Has anyone measured the Gunson reading numbers before cat and after cat?

I understand that 3-3.5 before the catalytic is preferred.

So, for the ones who played with the Gunson:

If before cat is 3.0, what is the number after installing a working catalytic?
What is after cat # for a 3.5?

I am waiting for the WD-40 to work through the rust around the O2-sensor to find out myself. And I am just wondering if someone has done this!!!

[Vipergrün]

I am sure others will chime in, but a CO of 3.5 pre-cat may toast the cat itself. That's pretty rich. Most folks I know who have increased the advance and mixture don't have cats... Just a thought.