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Q:

Popping from OE exhaust when car revved. Why? on 2008 Ford Mustang GT

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Has popped before and after K&N CAI installed. CAI made no difference in amount of popping nor sound of popping.
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