what is the benfit of removing your o2 sensor. i see that people do it after they get a test pipe witch i have. so if i wanted to pass emitions what would it take. a cat and o2 sensor? and can i pass if my check engine light is on because of the o2

 

If your check engine light is due to the O2 sensor, then all you need is a mechanical CEL fix. It works like a simulator and looks like this:

 

does that just screw into the bung after the test pipe. is there anything else needed. and where do i pick one up