2002 silverado, front mount turbo on passenger side. Drivers side exhaust runs to passenger side through a log style manifold. My stock post mounted o2 sensors have been removed. Only the fronts are still in place. I heard people say leave the front o2 sensors. The way I'm looking at it is, my drivers side o2 would read correct, but my passenger side would be reading, what the drivers side has already read. I'm guessing I would only need one. I also have a wideband installed. Should the o2 sensor be installed just prior to the turbo, so it could read all eight cylinders? Or do I even need the o2 sensors, being I have the wideband? I'm also learning on hp tuners and currently tuning on SD 2 bar. Thanks for the help

 

Put all three in the downpipe 6-10 inches after the turbo