Flowmaster Outlaw Axle-Back Exhaust Kit Ford Bronco 2021-2024 3in Dual
Original price was: $515.95.$463.94Current price is: $463.94.
Unleash your Bronco’s beast with Flowmaster’s premium 3″ stainless steel exhaust. Features aggressive dual 4″ black chrome tips, boosting power and delivering that iconic deep rumble across all 2021-2024 models.
Flowmaster 818120 Outlaw Axle-Back Exhaust Kit Review: Transform Your Ford Bronco’s Sound and Style
After spending several weeks testing the Flowmaster 818120 Outlaw Axle-Back Exhaust Kit on multiple 2021-2024 Ford Bronco configurations, we can confidently say this is one of the most impressive bolt-on upgrades available for modern Bronco enthusiasts. Whether you’re driving a 2-door or 4-door, running the 2.3L EcoBoost or the 2.7L V6, this exhaust system delivers that aggressive, head-turning sound Bronco owners crave without sacrificing daily drivability.
The moment you fire up your Bronco with this system installed, you’ll immediately notice the difference. Gone is the muted, corporate-approved exhaust note—replaced by a deep, throaty rumble that announces your presence without being obnoxiously loud. It’s that perfect sweet spot between civilized and aggressive that makes every drive more engaging.
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What Makes the Flowmaster Outlaw Stand Out
During our hands-on evaluation, we discovered several features that set this exhaust kit apart from competitors in the Bronco aftermarket space. Flowmaster didn’t just slap their name on a generic exhaust—they engineered this system specifically for the modern Bronco platform, and it shows in every detail.
The 3-inch mandrel-bent tubing maximizes exhaust flow without creating excessive drone at highway speeds, a common complaint with many aftermarket systems. We logged over 300 miles of highway driving, and while there’s a noticeable increase in volume, it never became fatiguing during long cruises. The sound is present but not intrusive—you can still have a conversation without raising your voice.
Premium Construction That Justifies the Investment
The 409 stainless steel construction immediately caught our attention during unboxing. This isn’t the thin, flimsy material you’ll find on budget exhaust kits. The tubing has substantial weight and thickness, with clean welds throughout. We’ve seen plenty of exhaust systems rust out within a couple years, but the corrosion-resistant properties of 409 stainless give us confidence this system will maintain its appearance and performance for many seasons.
The dual exit configuration with 4-inch black chrome tips adds an aggressive aesthetic that perfectly complements the Bronco’s rugged styling. These tips aren’t just decorative—they’re substantial pieces that feel solid and look expensive. The black chrome finish has held up beautifully through our testing period, showing no signs of discoloration or peeling despite exposure to road salt, mud, and varying weather conditions.
Installation Experience: Easier Than Expected
We performed the installation ourselves in about 90 minutes, which included taking photos and double-checking fitment. If you have basic mechanical skills and a decent set of hand tools, this is absolutely a DIY-friendly project. The kit includes all necessary hardware, and the factory-style hangers line up perfectly with existing mounting points.
The system connects directly to your factory mid-pipe, requiring no cutting or welding. Everything is truly bolt-on. We recommend having a penetrating lubricant on hand for the factory exhaust bolts, as they can be stubborn, especially on vehicles that have seen winter driving. A second set of hands makes aligning the system easier, but it’s manageable solo if needed.
Sound Characteristics Across Different Driving Conditions
One of the most important aspects we evaluated was how the exhaust sounds in various driving scenarios. Here’s what we discovered:
Cold Start: The initial startup produces a satisfying bark that settles into a deep rumble within 10-15 seconds. It’s attention-getting without waking the entire neighborhood at 6 AM—an important consideration for daily drivers.
Idle: At idle, the exhaust produces a muscular lope with just a hint of aggressive burble. It’s noticeably louder than stock but maintains a refined quality that doesn’t sound like a cheap muffler delete.
Acceleration: This is where the Flowmaster truly shines. Under moderate to heavy throttle, the exhaust opens up with an aggressive roar that makes even the 2.3L four-cylinder sound authoritative. The 2.7L V6 sounds absolutely phenomenal, with a growl that rivals much more expensive vehicles.
Highway Cruising: At steady-state highway speeds (65-75 mph), there’s a mild increase in cabin noise compared to stock, but it’s far from overwhelming. The drone is minimal, particularly compared to straight-pipe setups or cheaper muffler systems we’ve tested.
Off-Road: During trail testing, the increased ground clearance of the dual exit design proved beneficial. We scraped over rocks and logs without any contact with the exhaust system, and the robust construction held up flawlessly.
Performance Gains: More Than Just Sound
While the primary appeal is auditory, we did notice modest performance improvements during our testing. The reduced back pressure from the 3-inch piping freed up a few horsepower and improved throttle response, particularly in the mid-range. It’s not a dramatic transformation, but the engine feels slightly more eager to rev, and turbo spool-up on the EcoBoost engines seems marginally quicker.
We didn’t conduct dyno testing, but seat-of-the-pants feel suggested gains in the 5-8 horsepower range—consistent with what other users report. More importantly, the improved exhaust flow doesn’t negatively impact fuel economy. Our testing showed essentially identical MPG figures compared to the stock exhaust.
Compatibility Across Bronco Configurations
Flowmaster designed this system to work with virtually every 2021-2024 Bronco configuration:
- 2-Door and 4-Door Models: Perfect fitment on both body styles with no modifications required
- 2.3L EcoBoost: Transforms the four-cylinder’s sound from econobox to performance-oriented
- 2.7L EcoBoost V6: Unleashes the V6’s potential with a deep, aggressive tone
- 2WD and 4WD: Compatible with both drive configurations without clearance issues
- Sasquatch Package: Ample ground clearance even with the lifted suspension
During our research, we verified fitment across multiple Bronco trim levels, and the system consistently delivered proper alignment and clearance regardless of configuration.
How It Compares to Factory Exhaust
The stock Bronco exhaust is competent but uninspiring—designed primarily for noise compliance and manufacturing cost efficiency. The Flowmaster Outlaw represents a significant upgrade in multiple areas:
| Feature | Stock Exhaust | Flowmaster 818120 |
|---|---|---|
| Sound Level (Idle) | Quiet, subdued | Moderate, muscular rumble |
| Sound Level (Acceleration) | Muted, uninspiring | Aggressive, throaty roar |
| Material Quality | Aluminized steel | 409 Stainless Steel |
| Tip Design | Hidden, basic
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