A wideband is just a tool like anything else. It is NOT the be all end all. That said, we obviously rely on a wideband in our car, because it is EFI and I run it closed look to a target A/F. But still, the plugs, mph and ET slip all have to tell the same tale.
That 02 in that pic will be fine. It is plenty far from end of collector. Reversion only matters at low speed anyway. At full song there is no air being sucked into a collector.
