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Ok, I am going to be putting a cat back exhaust on the Expy and need to know, is a dual side exit exhaust louder inside the cab than a single side exit? Reason I'm asking is the wife is the primary driver of the Expy and doesn't want anything loud. Either of the cat backs will have the Flowmaster 50 series muffler with it so thats about the best for low in cab resonance. It won't be a true dual just pipe from the cat to either single in dual out or single in single out, then pipes out to the back. So just wondering if a dual is any louder than single?