I think your asking if the use of O2 extensions will prevent the CEL from turning on? Yes, they work great! Depending on what pipes you are going to be using, you might need a longer or shorter fitting, the berk's come with a "factory" extention but its not long enough. I did get the occasional CEL but seldom, maybe once every couple month's, just did the quick code clear steps.
For the topic of this conversation, if anyone suggest's using steel wool, try and stay clear from doing that, it's not the right way!
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