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Flows were awesome on the New Edge stangs, but they are a definite no-no on the S197.
You're going to want to go with a can-type muffler, not a chambered muffler.
Under acceleration the chambered mufflers sound as if a hummingbird with metal-tipped wings is frantically trying to get out of your muffler.
i had single chamber flows on my 87 gt. they sounded amazing. i was looking to buy the same for my 07 but after little research found they wont sound nearly as good. i went with some mac axle backs.