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Looks like another helpful thread that I have arrived to a bit late.
For those that are using this non-fouler/spacer are you still having good results with removing the P0430?
I replaced my entire exhaust system a couple years ago and just recently got the P0430 error.
New spark plugs. As for the plug wires they have less than 2000 miles on them.
I have heard of people using non-fouler/spacer for spark plugs, but no feedback on the success of using with 02 sensors.
I used them on the downstream O2 sensors on a Dakota I used to have. They seemed to work well. I got a code for them once or twice a year. The code is easy to clear.