I can't wait to get my modified header so I can play with my O2 sensors like you guys.
I think I'll just plug my sensors in and see what happens. I know J.fro said he tied his up to prevent a CEL but without them sensing something they will throw a light, no doubt. I like the washer thing as long as part of the sensing ports on the O2 sensor is out of the exhaust stream. Time will tell after I have them installed and I get a CEL.