I tired the bung extensions from z1 and they didn't work. The tuner at stillen told me and showed me that the 02 sensor didn't fit in the bung fully. It also rattled itself out of the bung. I was pretty disappointed because I kept on throwing the same codes.
With the hfc's your cat is smaller, therefore you are not filtering as much gas as your stock cat. you car leans out thinking it can burn less fuel to compensate for the lack of filtration causing a lean error. Larger cat more filtration, smaller cat less filtration and more power.
The only way to fix it with the current equipment that you have is to get it tuned. They will go into the fuel map and adjust the a/f for best performance. I suggest that you do any other breather mods before getting the tune so that you get the most of what you paid for.
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