There's several different extenders available. The ones I bought seem to be working so far no codes. Some have just a small opening / port (the ones I have) to allow gasses through, some are wide open and some have pieces included to make the port or hole different sizes (adjustable for the lack of better description).
With the Solo HF cats I had on my 45th SS (welded in extenders) it threw a code but that was due to a sensor that was sucking air from not being tightened / seated correctly. After chasing the threads and retightening all was good to go.
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