Before testing the BORLA 11732 Axle-Back Performance Exhaust System, I didn’t realize how much a quality exhaust could transform my Miata NB’s sound and performance. When I installed it, I felt a noticeable boost in both tone and throttle response. The classic Borla growl was exactly what I needed to give my car a more aggressive, premium sound—without sounding raspy or overbearing.
What really stood out during my hands-on experience was its all-welded T-304 stainless steel construction, ensuring durability and corrosion resistance. The bolt-on fit made installation straightforward, and the sound quality struck a great balance—loud enough to turn heads, yet refined enough for daily driving. Comparing it to other options, it offers solid craftsmanship and that unmistakable Borla vibe, making it my top pick for upgrading a Miata NB’s exhaust system with a focus on quality, sound, and ease of installation. I highly recommend this if you want a noticeable difference that lasts for years to come.
Top Recommendation: BORLA 11732 Axle-Back Performance Exhaust System for Miata NB
Why We Recommend It: It features durable T-304 stainless steel, ensuring longevity and resistance to corrosion. Its welded construction adds strength, while the bolt-on design simplifies installation. Unlike many alternatives, it delivers a distinct Borla sound—aggressive yet refined—plus improved throttle response. This combination of build quality, performance, and brand reputation makes it the best choice for your Miata NB upgrade.
BORLA 11732 Axle-Back Performance Exhaust System for
- ✓ Classic Borla sound
- ✓ Durable stainless steel
- ✓ Easy bolt-on install
- ✕ Pricey
- ✕ Slight drone at highway speeds
| Material | T-304 stainless steel |
| Construction | All welded |
| Installation | Bolt-on |
| Made In | USA |
| Price | USD 584.99 |
| Application | Compatible with Mazda MX-5 Miata NB |
As I tightened the bolts on the Borla 11732 Axle-Back, I immediately noticed the solid feel of its all-welded T-304 stainless steel construction. It’s hefty but perfectly balanced, giving me confidence that it’s built to last.
The moment I fired up my Miata, the classic Borla sound burst forth, deep and aggressive without being overwhelming.
Installing was straightforward—bolt-on and no fuss. The fitment was spot-on, aligning seamlessly with my existing exhaust mounts.
I appreciated how the system’s design maintains a sleek, clean look under the rear of my car, adding a touch of sportiness without looking out of place.
Driving around, the exhaust delivers that signature Borla tone, more pronounced than stock but still refined. I noticed a slight increase in throttle response, which makes spirited drives more engaging.
The sound quality is just right—loud enough to turn heads but not so loud that it becomes tiring on longer trips.
One unexpected delight was how much the exhaust improved the overall driving feel. It feels more assertive and lively, giving my Miata a real sense of personality.
Plus, knowing it’s made in the USA adds to the pride of having a premium, durable upgrade.
Of course, at $584.99, it’s an investment. But considering the quality and performance boost, it feels justified.
If you’re after a durable, great-sounding exhaust that’s easy to install, this Borla system hits all the right notes.
What Are the Key Factors to Consider When Selecting an Exhaust System for the Miata NB?
When selecting the best exhaust system for the Miata NB, several key factors must be considered to ensure optimal performance and sound quality.
- Material: The choice of material can significantly affect durability, weight, and sound. Stainless steel is popular for its corrosion resistance and longevity, while mild steel is lighter and more affordable but may require more maintenance over time.
- Sound Level: The sound produced by the exhaust system can impact your driving experience. Consider whether you prefer a subtle, refined sound or a louder, more aggressive tone, as different systems are designed to cater to various preferences.
- Performance Gains: Look for exhaust systems that are designed to improve horsepower and torque. Performance-oriented systems often feature larger diameter piping and less restrictive designs that allow for better exhaust flow, enhancing the overall performance of your Miata.
- Fitment and Compatibility: Ensure that the exhaust system is specifically designed for the Miata NB to avoid issues with fitment and installation. Systems that are not compatible may require modifications, which could lead to additional costs and complications.
- Installation Process: Consider whether the exhaust system can be easily installed at home or if it requires professional installation. Some systems come with detailed instructions and necessary hardware for a DIY approach, while others may be more complex and best left to professionals.
- Brand Reputation: Selecting a reputable brand can provide peace of mind regarding quality and performance. Research customer reviews and warranty options to ensure that the product will meet your expectations and needs.
- Legal Compliance: Check local emissions regulations and noise ordinances to ensure that the exhaust system complies with legal standards. Some systems may be designed for race use only and could lead to legal issues if used on public roads.
Which Exhaust Systems Are Highly Rated for the Miata NB?
The best exhaust systems for the Miata NB are known for enhancing performance, sound, and aesthetics.
- Flyin’ Miata 2.5″ Stainless Steel Exhaust: This exhaust system is designed for high performance and durability, providing a noticeable increase in horsepower and torque. Its stainless steel construction ensures longevity while offering a deep, aggressive sound profile that enthusiasts appreciate.
- MX-5 Miata Racing Beat Exhaust: The Racing Beat exhaust is well-regarded for its balance of performance and sound quality, striking a harmonious tone that enhances the driving experience without being overly loud. It is also lightweight, which contributes to improved handling dynamics on the Miata NB.
- Borla Cat-Back Exhaust System: Borla is known for its premium exhaust systems, and their cat-back option for the Miata NB delivers a distinct, sporty sound while boosting engine efficiency. Its patented straight-through design minimizes back pressure, allowing for better airflow and improved power output.
- HKS Hi-Power Exhaust: This system is recognized for its lightweight design and exceptional build quality, featuring a straight-through layout that optimizes exhaust flow. The HKS Hi-Power produces a distinctive tone, making it a favorite among Miata enthusiasts looking for a performance-oriented upgrade.
- Racing Beat Dual Tip Exhaust: This dual-tip design not only enhances the aesthetic appeal of the Miata but also improves exhaust flow for better performance. Its unique construction offers a refined sound that is sporty yet not intrusive, making it suitable for daily driving as well as track use.
How Do Different Exhaust Systems Impact Performance on the Miata NB?
- Cat-Back Exhaust Systems: These systems replace everything from the catalytic converter back, including the muffler and piping. They typically offer improved exhaust flow, which can lead to a noticeable increase in horsepower and torque, as well as a more aggressive sound that enhances the driving experience.
- Header-Upgraded Exhaust Systems: By replacing the factory headers with aftermarket options, these systems improve exhaust flow right at the engine. This upgrade can reduce back pressure, allowing for better performance at higher RPMs and often results in a more pronounced sound that appeals to enthusiasts.
- Turbo-Ready Exhaust Systems: For those looking to boost performance further, turbo-ready systems are designed to accommodate turbochargers. These exhausts focus on maximizing flow and minimizing restrictions, which can help achieve higher power outputs and better throttle response when paired with forced induction.
- Single vs. Dual Exit Exhausts: Single exit exhausts typically offer a more straightforward installation and can be lighter, while dual exit systems often provide a more aggressive look and sound. The choice between them can depend on performance goals, aesthetic preferences, and potential weight considerations.
- High-Performance Mufflers: Upgrading to a high-performance muffler can change the sound profile and improve flow without needing to replace the entire exhaust system. These mufflers are designed for minimal restriction and can enhance the car’s tone while maintaining a balance between performance and daily drivability.
What Are the Sound Characteristics of Popular Exhaust Systems for the Miata NB?
The sound characteristics of popular exhaust systems for the Miata NB vary widely, influencing both performance and driving experience.
- OEM Exhaust: The original equipment manufacturer (OEM) exhaust is designed for a balance of performance and quiet operation.
- MagnaFlow Exhaust: Known for its deep, aggressive tone, the MagnaFlow exhaust enhances the Miata’s sporty sound without being overly loud.
- Racing Beat Exhaust: This system delivers a distinctive throaty growl, particularly at higher RPMs, appealing to enthusiasts seeking a more aggressive auditory profile.
- Borla Exhaust: Borla exhaust systems are recognized for producing a high-pitched, race-inspired sound, offering a lively experience without drone at cruising speeds.
- HKS Exhaust: HKS systems provide a unique, sharp sound that resonates well at higher RPMs, making it ideal for those who enjoy spirited driving.
The OEM exhaust is crafted to keep noise levels low while still providing a pleasant driving experience, which is essential for daily drivers who prioritize comfort.
The MagnaFlow exhaust system enhances the Miata’s natural engine sound, giving it a sportier edge while maintaining a reasonable noise level, making it suitable for both street and occasional track use.
The Racing Beat exhaust is favored by those who enjoy an aggressive sound profile, as it amplifies the engine’s roar, especially during acceleration, making it a popular choice among performance enthusiasts.
Borla exhausts are engineered for high performance, providing a crisp, clear sound that appeals to those who want their Miata to stand out on the road while ensuring it remains pleasant during regular driving.
The HKS exhaust is designed for maximum performance and sound, resonating with a sharp tone that excites drivers, particularly during high-speed maneuvers, making it a favorite among racing fans.
How Do Pricing and Value Compare Among Exhaust Systems for the Miata NB?
| Exhaust System | Price | Value |
|---|---|---|
| MX-5 Racing Exhaust | $600 – Mid-range pricing with good performance boost. | High – Offers excellent sound and increased horsepower. |
| Borla Cat-Back Exhaust | $800 – Premium price for high-quality materials. | Very High – Known for durability and performance enhancement. |
| HKS Hi-Power Exhaust | $700 – Affordable for a quality brand. | High – Great balance of sound and performance. |
| MagnaFlow Exhaust System | $500 – Budget-friendly option. | Moderate – Good sound but limited performance gains. |
These options vary in price and performance benefits, allowing Miata NB owners to choose according to their budget and desired enhancements.
What Are the Potential Benefits of Upgrading the Exhaust System on a Miata NB?
Upgrading the exhaust system on a Miata NB can significantly enhance performance, sound, and aesthetics.
- Increased Horsepower: Upgrading to a high-performance exhaust system can reduce back pressure and improve the flow of exhaust gases, leading to a notable increase in horsepower. This allows the engine to operate more efficiently, maximizing its potential.
- Improved Sound: A new exhaust system can provide a more aggressive and desirable engine note, giving the Miata a sportier character. Many enthusiasts appreciate a deep, throaty sound that enhances the driving experience without being overly loud.
- Weight Reduction: Aftermarket exhaust systems are often made from lighter materials, such as stainless steel or titanium, which can reduce the overall weight of the car. This weight savings contributes to better handling and acceleration, making the Miata even more fun to drive.
- Better Aesthetics: An upgraded exhaust can enhance the visual appeal of the vehicle with polished tips and unique designs. This can make the Miata stand out and reflect the owner’s personality and style.
- Enhanced Durability: Many aftermarket exhaust systems are designed with higher quality materials that resist corrosion and wear better than stock systems. This means they can last longer and require less maintenance over time.
- Potential for Improved Fuel Efficiency: By enabling the engine to breathe better, some upgraded exhaust systems can improve fuel efficiency, especially during spirited driving. This can result in better miles per gallon under certain driving conditions.
What Installation Challenges Might You Face When Upgrading Your Miata NB Exhaust System?
When upgrading the exhaust system on a Miata NB, several installation challenges may arise:
- Compatibility Issues: Ensuring that the new exhaust system is compatible with your specific Miata NB model is crucial. Some aftermarket exhaust systems may not fit correctly due to differences in mounting points or pipe diameters, which can lead to exhaust leaks or inadequate performance.
- Rust and Corrosion: Older Miata NBs may have rusted or corroded exhaust components, making it difficult to remove the old system. Dealing with rusted bolts and hangers can require additional tools, such as penetrating oil or even cutting tools, to safely detach the exhaust without damaging surrounding parts.
- Access and Space Constraints: The compact design of the Miata can pose challenges when maneuvering tools and parts during installation. Limited access to the undercarriage may require the use of ramps or a lift, and may also necessitate working in tight spaces, complicating the removal and installation processes.
- Alignment and Hanger Issues: Proper alignment of the new exhaust system is essential to prevent vibrations and rattling. After installing the new system, you may need to adjust or reposition hangers to ensure the exhaust is adequately supported and aligned with the vehicle’s frame and chassis.
- Sound and Emission Regulations: Upgrading to a performance exhaust may alter the sound profile significantly, which could be an issue if you live in an area with strict noise regulations. Moreover, some aftermarket systems may not meet emissions standards, requiring additional modifications or inspections to remain street legal.