Originally Posted by re-rx7
Tim would you say a Tune is needed with a O/R X or H? From what I've researched the COT protection only kicks in on decel? The worst I can see happening is you run a tad bit richer and a check engine light. SOme tunes like AED and such have specified they dont change anything just remove the Check Engine light? Input?
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You, you will need a tune when you delete the cats. If not, the car will run open loop and just dump fuel trying to cool the cats that aren't there anymore. You will run rich and get horrible gas mileage and a putrid smell.
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