Where did you guys mount your wideband on ARH LTH? Before the o2 sensor,after or on the x pipe?
I have mine right after the collector on the x pipe (next closest spot behind the upstream o2 sensor)
Just remember the farther away from the engine the slower the response to give the reading
I think per instructions it says like 12'' away or somewhere around there
I have taken lab grade NTK sensors with my AFM1000 widebands and put them in different places in the exhaust to measure A/F simultaneously. There is really no shift in a/f reading, only a delay and smoothing effect if you put it farther back or after a cat.
Cats essentially don't work at WOT, they just introduce a little bit of oxygen (which shows a leaner a/f) for a few seconds and then clear out. In some cases its better to get a reading after the cat, as high backpressure before the cat can shift the a/f reading by as much as .5, a stock GT500 has 15psi of backpressure and that is enough to shift the reading.
IMO the rumor of widebands reading leaner in the tailpipe or after cats started because of dynojet vacuum pumps with leaks in the tubing and worn out sensors.
Plenty of scientific and proven information regarding position of wideband sensor. The difference is extremely negligible. VMP also did their own studies showing the same results. I believe Justin posted it up a few years back.
Just delete the rear o2 sensors in the tune. Plug the passenger side rear o2 sensor bank. Use the driver side rear sensor bung for the wideband.