Hi Bullfighter. There are a lot of custom setups out there and more data is better when a tuner has a car on the dyno. That said, wideband 02 sensors are typically installed on a single side, before the CAT and near the head (bank1/cylinder1, if you can). My Pentastar is out on a stand and the original JK exhaust is on the floor. If I can I'll look it over this weekend and see if a logical spot jumps out at me. I'll snap a couple of pics if I can.