FLOWMASTER American Thunder Axle-Back Exhaust – 3 in Stainless Steel | 2021+ Ford Bronco 2.3L & 2.7L

3 in Stainless Steel Axle-Back Exhaust | Single Exit | 2021+ Ford Bronco 2.3L / 2.7L | SKU: 818121

Upgrade your Bronco with the FLOWMASTER American Thunder Axle-Back Exhaust System (818121). Designed specifically for the 2021–2026 Ford Bronco 2.3L and 2.7L EcoBoost, this exhaust system delivers classic Flowmaster sound, improved exhaust performance, and durable stainless steel construction for daily driving and off-road adventures.

The American Thunder Series is engineered to provide the perfect balance between a mild cruising tone and an aggressive sound under throttle with minimal interior drone. Featuring a tuned 60 Series performance muffler, this system delivers a deep exhaust note while maintaining excellent drivability.

Constructed from mandrel-bent 409 stainless steel tubing, the 818121 axle-back system improves exhaust flow and durability while enhancing the rear appearance of your Bronco. This single-exit design is ideal for Bronco owners looking for aggressive sound without excessive volume.

Key Features

• SKU: 818121
• Fits 2021–2026 Ford Bronco 2.3L & 2.7L EcoBoost
• 3-inch mandrel-bent stainless steel tubing
• American Thunder Series tuned 60 Series muffler
• Single exit axle-back configuration
• Aggressive to moderate exhaust tone
• Minimal interior drone during cruising
• Improves exhaust flow and performance

⚠️ Fitment Note (IMPORTANT)

❗ Fits 2021–2026 Ford Bronco 2.3L & 2.7L models
❗ Does NOT fit Bronco Sport models
❗ Always verify trim level and factory exhaust configuration before ordering
❗ Professional installation recommended

American Thunder Sound

• Deep aggressive exhaust tone under acceleration
• Moderate sound level during normal cruising
• Designed to minimize interior drone
• Tuned specifically for daily-driven Broncos

👉 Perfect balance of aggressive sound and everyday drivability

Performance Benefits

• Improves exhaust flow efficiency
• Mandrel-bent tubing maximizes airflow
• Helps improve throttle response
• Dyno-tested gains up to 19 HP and 19 lb-ft of torque at the rear wheels

👉 Performance-inspired sound with improved airflow

Durability & Construction

• Constructed from corrosion-resistant 409 stainless steel
• Built to withstand harsh weather and off-road conditions
• Engineered for long-term durability and performance
• Designed for daily driving and trail use

👉 Built to perform on and off the trail

Installation

Direct-fit axle-back exhaust installation
Professional installation recommended
Uses factory mounting locations
Typical install time: ~1–2 hours

What’s Included

• FLOWMASTER American Thunder axle-back exhaust system
• 60 Series performance muffler
• Installation hardware
• Installation instructions

Specifications

• Brand: FLOWMASTER
• Part Number: 818121
• Series: American Thunder
• Exhaust Type: Axle-Back Exhaust System
• Tubing Diameter: 3 Inches
• Exit Configuration: Single Exit
• Material: 409 Stainless Steel
• Vehicle Fitment: 2021–2026 Ford Bronco 2.3L / 2.7L

Popular Applications

👉 2021+ Ford Bronco 2.3L & 2.7L EcoBoost

Perfect for Bronco owners looking to upgrade exhaust sound, improve performance, and maintain comfortable daily drivability.

👉 Ideal for daily drivers, overland builds, lifted Broncos, and off-road setups

Why Buy from Iron Ridge Offroad

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Upgrade your Bronco with the FLOWMASTER American Thunder Axle-Back Exhaust System (818121) engineered for aggressive sound, improved performance, and rugged durability.