HFC's
 

Probably should have posted this here a few days ago....

Installed AAM high flow cats last week- love them! Problem is the p0420 code. I'm going to try the non-fouler spark plug route for the 02 sensors- are there different sizes of non-foulers I need to be concerned with? What size do I need for an '08 g37 coupe (18mm?).<!-- google_ad_section_end -->

Got the non-foulers ok... my question now is does anyone have any experience on how many non-foulers were needed coupled together to get the sensor far enough away from the HFC airflow to not trigger the code? I know I'll need at least 2, but I might need 3 to get the 02 sensor far enough away. My concern is the AAM HFC's I have (try saying that 3 times fast) have the sensor pointing at a downward angle, so I'm worried the 02 sensors could be in harms way if I get them extended too far out. Any help or ideas from anyone is appreciated. Thanks!
Bob

Another opton is to get an Uprev tune.. you can disable those codes permanently

P0420 is a "catalytic converter bank 1" code.

Doesn't that mean the O2 sensor for passenger side cat is bad?

All it means is that the sensor detected something out of the ordinary, very common with HFC/TP

I used 2 nonfoulers when I had TPs and it seemed to work without an issue.

Thanks- will give it a try tonight.