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I never noticed it with my stock exhaust because it was too quiet. Once I got aftermarket mufflers, it was only then did I notice it.
If I had returned to stock mufflers now, I could probably tell when it kicks in, because I now know what too look/listen for.
Not that it matters in my case, because after I get my car tuned next week, the AFM will be a thing of the past.
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