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I didn’t notice the AFR in the posted graph.....and it is strange that it isn’t obvious that it richens up with the power dip.
That being said, my mustang load dyno graph both stock, and with 2nd cat delete catback has the identical dip, in the identical spot, and correlates exactly with the data for COT turning on. A tuner I know said every ZL1 he’s had on the dyno goes into COT on the stock file (but that tuner is kinda iffy). But my car certainly goes in COT no matter what on the dyno,...nothing to do with weather or heat soak either.
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