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I did the muffler delete on my A6 and installing the CAI by CAI. The AFM changes are noticable but really not that bad - just a strange sound on the highway and some around town. You can get rid of it by changing to manual shift mode, shift down to 5th and back to 6th. However I plan on a new exhaust in about another year and tune out AFM. I just want the warranty for now.
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