I noticed this week when I had my exhuast done, that there is no O2 sensor after the main cat. I am assuming this means you can remove it and not get a check engine light. This is pretty strang for an OBDII vehicle. Has anyone done this?

Jesse

 

Quite a few people have replaced the main cat with a test pipe. I think emax punched out the cat on his last Max.

I also think Custommaxima sells a bolt-on test pipe if you wanted to do this.

 

In the FAQ, it mentions that there are differences in placement of 0-2 sensors depending on if your vehicle is Fed or Cali Spec.

 

On my cali spec 2k21 there is no o2 sensor in the cat or after it. So I have a test pipe in there.