wouldn't a truck with a stock single exhaust system only have ONE frontal oxygen sensor? or am I wrong? If I am not, I am about to put a set of longtubes on and am wondering what to do about the other header plug hole...do I just plug it...if so does someone make plugs for that? Thank you guys so much! I have posted about exhaust a lot lately and you guys are awesome!

 

My stock 5.3 setup has 4 oxygen sensors. 2 each side. 1 before and 1 after the cat.

 

There should only be one hole in each header. That is the front O2 sensor and you have to keep that one. If you are going to remove your cats then you have to run O2 sims or get a custom tune with the rears turned off.

 

I just got my set of long tube pacesetters in....do I need o2 extensions?

 

My ASM headers are long and I did not need extension. I doubt you will need them on the pacesetters.

 

I was told you don't need them.