{"product_id":"flowmaster-american-thunder-axle-back-exhaust-system-2021-2025-ford-bronco-2-3l-2-7l-818121","title":"Flowmaster American Thunder Axle-Back Exhaust System - 2021+ Ford Bronco 2.3L\/2.7L | 818121","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Flowmaster American Thunder Axle-Back Exhaust System (Part #818121) is a direct-fit performance upgrade engineered specifically for the 2021+ Ford Bronco equipped with the 2.3L EcoBoost or 2.7L EcoBoost engine. Designed for Bronco owners who demand an aggressive, distinctly American exhaust note without sacrificing reliability or daily drivability, this axle-back system delivers the iconic Flowmaster sound in a bolt-on installation. Upgrade your Bronco's personality on the trail and on the street with this precision-crafted exhaust solution.\u003c\/p\u003e\n\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIconic American Thunder Sound\u003c\/strong\u003e – Flowmaster's signature deep, aggressive exhaust tone gives your Ford Bronco a commanding presence on and off the road without being obnoxiously loud at highway speeds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect-Fit Bolt-On Design\u003c\/strong\u003e – Engineered specifically for the 2021–2025 Ford Bronco, this axle-back system uses factory mounting locations for a hassle-free installation with no cutting, welding, or modification required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMandrel-Bent Stainless Steel Construction\u003c\/strong\u003e – Premium stainless steel tubing and components resist corrosion and withstand extreme off-road and weather conditions, ensuring long-lasting durability mile after mile.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerformance-Tuned Muffler\u003c\/strong\u003e – Flowmaster's proven chambered muffler technology reduces exhaust backpressure to optimize engine breathing and throttle response for a more spirited driving experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolished Exhaust Tips\u003c\/strong\u003e – Aggressive, show-quality polished stainless steel tips enhance the Bronco's rugged exterior aesthetics and complete the look of the system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetains Factory Ride Quality\u003c\/strong\u003e – Axle-back configuration preserves OEM catalytic converters and mid-pipes, maintaining emissions compliance and a smooth, refined ride character.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in the USA\u003c\/strong\u003e – Proudly designed and manufactured in the United States to Flowmaster's rigorous quality standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFlowmaster American Thunder axle-back muffler assembly\u003c\/li\u003e\n\u003cli\u003ePolished stainless steel exhaust tip(s)\u003c\/li\u003e\n\u003cli\u003eAll necessary hardware and clamps for installation\u003c\/li\u003e\n\u003cli\u003eFlowmaster installation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e818121\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eFlowmaster\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eAmerican Thunder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSystem Type\u003c\/th\u003e\n\u003ctd\u003eAxle-Back\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTip Finish\u003c\/th\u003e\n\u003ctd\u003ePolished Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSound Level\u003c\/th\u003e\n\u003ctd\u003eAggressive \/ Moderate-Loud\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e090127140284\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEmissions Compliance\u003c\/th\u003e\n\u003ctd\u003eNot CARB Exempt – Check local regulations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFitment \u0026amp; Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis Flowmaster American Thunder Axle-Back Exhaust System is a direct, confirmed fitment for the following vehicles:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2021 Ford Bronco – 2.3L EcoBoost 4-Cylinder\u003c\/li\u003e\n\u003cli\u003e2022 Ford Bronco – 2.3L EcoBoost 4-Cylinder\u003c\/li\u003e\n\u003cli\u003e2021 Ford Bronco – 2.7L EcoBoost V6\u003c\/li\u003e\n\u003cli\u003e2022 Ford Bronco – 2.7L EcoBoost V6\u003c\/li\u003e\n\u003cli\u003e2023 Ford Bronco – 2.3L EcoBoost 4-Cylinder\u003c\/li\u003e\n\u003cli\u003e2023 Ford Bronco – 2.7L EcoBoost V6\u003c\/li\u003e\n\u003cli\u003e2024 Ford Bronco – 2.3L EcoBoost 4-Cylinder\u003c\/li\u003e\n\u003cli\u003e2024 Ford Bronco – 2.7L EcoBoost V6\u003c\/li\u003e\n\u003cli\u003e2025 Ford Bronco – 2.3L EcoBoost 4-Cylinder\u003c\/li\u003e\n\u003cli\u003e2025 Ford Bronco – 2.7L EcoBoost V6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Compatible with 2-door and 4-door Ford Bronco body styles. Does not fit the Ford Bronco Sport. Always verify fitment using your vehicle's year, make, model, and engine before ordering.\u003c\/p\u003e\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eThe Flowmaster American Thunder Axle-Back Exhaust System is designed as a direct bolt-on replacement that an experienced home mechanic can complete with basic hand tools in approximately 1–2 hours. The system connects at the factory axle-back junction point using included clamps and hardware, requiring no cutting or welding. For best results, installation on a vehicle lift or with proper jack stands is recommended. Professional installation by a certified exhaust shop is always an option for those who prefer it. Always allow the factory exhaust system to cool completely before beginning work.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this exhaust CARB compliant?\u003c\/strong\u003e This product is not CARB (California Air Resources Board) exempt. It is intended for off-highway or racing use in emissions-regulated states. Check your local and state regulations before purchasing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit the Ford Bronco Sport?\u003c\/strong\u003e No. This system is designed exclusively for the full-size 2021–2025 Ford Bronco (2.3L and 2.7L engines) and does not fit the Bronco Sport.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this require a tune after installation?\u003c\/strong\u003e No ECU tune is required for this axle-back exhaust system. It is a direct bolt-on upgrade that does not alter intake or engine management.\u003c\/p\u003e","brand":"Flowmaster","offers":[{"title":"Default Title","offer_id":53007024193856,"sku":"flo818121","price":549.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/8557\/2416\/files\/7c8efe2761478a72c7f11fb1184ad31fS.jpg?v=1786378925","url":"https:\/\/buckleupoffroad.com\/products\/flowmaster-american-thunder-axle-back-exhaust-system-2021-2025-ford-bronco-2-3l-2-7l-818121","provider":"Buckle Up Off-Road","version":"1.0","type":"link"}