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Discussion Starter #1
Still throwing the above code..but
1.Gutted the cats
2. Installed Big Daddy Garage 02 sensor extenders.
3. Cleaned existing back O2 sensors overnight in 91 grade clean gas and scrubbed with nylon brush.
4. No noticable performance issues (acceleration, gas mileage, idling, etc).

Any ideas other than the electrical tape over the SES light?

Thanks
 

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I’m always a big fan of installing catalytic converters but...

no amount of soaking your sensors in fuel will provide any benefit even if it’s racing gas

rear o2 simulators will outperform extenders/anti-foulers

electrical tape is cheap
 

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Cut and past from first search result for your code...

"P0420 typically means that a converter has worn out or degraded—not obstructed or clogged."

This is a code for lack of Cat efficiency. Why would you think that gutting your cats would get rid of the code? If anything you've decreased the efficiency even further.

The only way to drop that code is to either replace the cats with proper working units and make sure that you're O2 sensors are in good condition, or install O2 sensor simulators.

Keep in mind that depending on your state, a lack of or gutted Cats and using O2 sensor simulators may be illegal (and by EPA regulations probably is on the federal level).

Looking at the Big Daddy site I see that the spacers are actually "mini" catalytic converters built into spacers that attempt to convert enough emissions between the main pipe and the sensor. Perhaps with the complete lack of the main cats the level of emissions is too high for the Big Daddy to handle (since it is a very small honeycomb) or the O2 sensor is simply bad.
 

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Ground connections....
 
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