I recently converted my 98 gsr to OBD1 w/ Skunk2 harness & a p72.
can I run a straight pipe / test pipe w/ out the check engine light coming on.
I've heard mixed opinions...some say yes, the second O2 sensor can be eliminated completely...others say, no it must stay there & run parallel w/ the 1st sensor...which is true? thanks...

 

???

 

No, you do not need the secondary O2. I have mine unplugged. No CEL's or anything, runs the same too

 

thanks...