he didnt have a cell come on…atleast for the 20 minutes after before we left he didnt.
His setup used all 4 o2 sensors…the rear stockers mounted right up and we just had to extended the fronts by about 2’.
if you are worried about it, I have two o2 simulators I will sell you for cheap. Im sure you know what they are/do so no need to tell you about them
other then that, yes it will get tuned out if you get a tuned.