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The orgional problem was the fuel mix was lean. Lean fuel ratio creates more heat, which was burning the precats. It was actually heat burning them, not the chemical reaction with gas. If it was super rich and to much gas was getting to the cats them they could burn that way to from the chemical reaction in the cats.
This is how it was described by mitsubishis letter sent to their tech centers.
Now either way, both settings may have been rich by some others standards but when compared from the reflash the change was richer.
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