36 reactions | Flowmaster introduces our American Thunder axle-back exhaust system for the 2021-2022 Ford Bronco with the 2.3 or 2.7-liter engine. This system uses a 60 Series style muffler for an aggressive to moderate exhaust tone and increased performance. Maximum dyno gains of 19 hp and 19 lb-ft. were measured at the rear wheels. Get yours here: https://holley-social.com/818121AmericanThunderAxle-Back #FlowMaster #FlowMasterMufflers #FlowMasterEquipped | Flowmaster | Facebook

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