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Sounds like an old-fashioned glasspack muffler! 40 years ago a straight perforated pipe through fiberglass packing (24-48 inches), would silence any V8 to the point of virtually no sound inside the car, and barely louder than "stock" outside. And it would last 100,000 miles or more.
But it didn't work so well on 4-cylinder motors. (Witness the "fart can" mufflers on sport compacts today.)
I'd like to know what's different in this design.