Just make sure to install those reducers so the O2 sensor is angled downward (so moisture doesn't collect on the tip). Hopefully that doesn't put it in a spot that's impossible to get to since the flanges on your headers are welded.
Yeah I was worried about that. Looked through the reviews and found this: "The Hedman Hedders 21142 allows you to rotate the sensor to any position and eliminated my problem"
I assume the reducers flange is not welded to the reducer so it will rotate. I will know for sure today since my order will be arriving.