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A few months ago I put on a stainless works high flow catted downpipe and a Bama tune. Unfortunately the check engine light came on because of "inefficient cats" Bama wrote me a new tune that had the O2 sensors turned off so the check engine light would go away. Unfortunately I now need to pass...

Before my car was tuned I noticed that the air/fuel ratio hovered around 14.5, now it is 14.0 on average. I am curious as to how low the air/fuel ratio can go before it will kill the cats. The reason I asked is because less then 200 miles after tuning the car my engine light came on for P0420...