Quote:
Originally Posted by staples87
It's actually the opposite. The richer the fuel, the more the cat has to work. In turn that's going to generate more heat, clog them and take them out.
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Richer = Cooler exhaust temps = longer cat life. Period.
That's why COT (cat over-temp) protection mode makes the AFR rich(er), which creates lower temps in the cylinder/exhaust to protect the cats.