Downpipe O2 Spacers

[samperes]

I just recently read up on o2 spacers related to a catless downpipe, and I just realized I actually have a spacer on both sensors on my own downpipe. I read it should only be on one… Is this true? I may or may not have been running it like this for a month..

 

[dhminer]

It should only be on the downstream sensor

 

[samperes]

It should only be on the downstream sensor

Thank you. Downstream would be after where the CAT would be?

 

[dhminer]

Thank you. Downstream would be after where the CAT would be?

That’s correct. The one closest to the engine should not have the spacer