Can I put a straight dual exhaust on my 99 navigator and eliminate the cats without worrying about all of the O2 sensors? Can I just weld bungs on the exhaust and put the O2 sensors back in place? I am pretty sure I have 2 sensors before the cats and 2 after. Will the O2 sensors detect that there is no pressure, heat or flow difference and make the vehicle run lean or shut it down?

Thx, for the help.

 

You will need O2 sims for the rear O2s to keep the CEL off, otherwise it will run decent, maybe not as with as much low end torque as before though.