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Originally Posted by Jpjr  I don't think they would check the ECM for manipulation to replace the cats. I think they would only really check if you hurt your motor. |
According to the GM letter bad Cats was one of the specific things they were to check for a tuned ECM if they were to be replaced under warranty. Due to the fact they said a bad tune could cause premature failure. Now whether a particular dealership does this will probably vary depending upon who one goes to. But as I understand it for a Cat to go bad due to "poisoning" one would have to be running rich. Since these cars appear to come from the factory running PIG rich, I would think a decent tune that would better balance the fuel-air mixture would not only gain some HP, but also extend the Cat's service life ?