Comparing Sound on Three Flowmaster Muffler Kits on a S197

Comparing Sound on Three Flowmaster Muffler Kits on a S197

We test three muffler kits on an S197 Mustang - The Hushpower axle-back system, utilizing the Hushpower “Pro Series” round mufflers; the American Thunder axle-back kit, utilizing the 40-series classic dual-chamber mufflers; and the American Thunder cat-back kit, using the 60-series Delta Flow mufflers.

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