If you’re looking to enhance your Miata’s performance, improve its sound profile, or add some aesthetic flair, upgrading the exhaust is one of the best modifications you can make.

The stock exhaust on an NA Miata, while functional, was designed with a balance of noise control and emissions in mind, meaning it’s often restrictive. This can limit airflow, reducing the car’s performance potential and keeping the exhaust note far too quiet for most enthusiasts. An aftermarket exhaust system can address these limitations, offering increased horsepower, a more aggressive and engaging sound, and a sleek, stylish look that adds to the car’s appeal. Whether you’re after more power for the track or just want to turn heads during your daily commute, an exhaust upgrade can completely transform your driving experience.

Understanding Exhaust Systems

Before diving into the best aftermarket exhaust options, it’s crucial to understand how these systems work and what they can do for your NA Miata. An exhaust system plays a key role in how efficiently your engine expels gases. The faster and smoother this process, the more efficiently your engine can run, leading to increased horsepower and torque. Aftermarket exhausts are designed with this in mind, reducing back pressure and increasing airflow, which results in tangible performance gains, particularly at higher RPMs where the engine is working hardest. A well-designed exhaust can add around 5-10 horsepower, giving your Miata a noticeable boost in performance.

Aside from performance, one of the most significant factors to consider when upgrading your exhaust is the sound. The stock exhaust is often too quiet for those who want a sporty, aggressive exhaust note. Aftermarket systems allow you to choose a sound profile that fits your preferences, from a subtle growl to a loud, roaring note. If you’re using your Miata for daily driving, you may want something quieter, while track enthusiasts often opt for louder, more aggressive systems. Another benefit of upgrading your exhaust is weight reduction. Many factory exhaust systems are built from heavier, cost-effective materials, which can negatively impact performance. Lighter aftermarket systems can shave several pounds off your car, improving handling and acceleration. Finally, aesthetics play a role in many people’s decision to upgrade. Aftermarket exhausts come in various designs, from polished stainless-steel tips to dual exit options, allowing you to give your Miata a more distinctive, aggressive look.

NA Miata Exhaust Picks

RoadsterSport 3 Exhaust

The RoadsterSport 3 is a popular choice among Miata owners due to its balance of sound and performance. One of its standout features is the removable baffle, which allows you to adjust the exhaust note to your liking. With the baffle in, the sound is deep and refined, making it perfect for daily driving. Remove the baffle, and you get a much more aggressive growl that’s great for track days. This exhaust offers improved high-RPM performance, thanks to its straight-through design, which reduces back pressure. Constructed from polished stainless steel, the RoadsterSport 3 is built to last, and its sleek design adds a touch of style to your Miata’s rear. While it’s on the pricier side, typically selling for around $499 on sale (originally $688.85), its versatility makes it worth the investment.

Flyin’ Miata High-Flow Exhaust

Borla Cat-Back Exhaust

Borla’s Cat-Back exhaust is well-known for delivering a premium sound and build quality. This system strikes a balance between performance and practicality, making it ideal for those who want an upgrade without sacrificing daily drivability. The exhaust note is deep and sporty, but not obnoxious, making it perfect for drivers who want a noticeable but refined sound. In terms of performance, this system provides a modest increase in horsepower and improved throttle response. The polished stainless-steel tips add a refined, sporty look to the Miata’s rear end. While it’s one of the more expensive options, typically priced around $796, its durability and sound quality make it a worthwhile investment for those who want the best of both worlds.

ISR Performance GT2 Exhaust

For drivers who want their Miata to make a statement, the ISR Performance GT2 exhaust is a fantastic option. This is one of the louder systems on the market, delivering a deep, aggressive growl that is sure to turn heads. While it’s great for the track, some drivers may find it a bit too loud for daily use. Performance-wise, it offers significant gains, particularly in the upper RPM range, making it a popular choice for track-focused builds. The lightweight stainless-steel construction ensures durability and weight savings. Priced at around $550, the ISR GT2 offers excellent value for those seeking a bold, performance-oriented exhaust.

Cobalt Exhaust

If you’re looking for a budget-friendly option that still offers solid performance and sound improvements, the Cobalt Exhaust is worth considering. This system provides a sporty exhaust note that is louder than stock but not overwhelming. It’s a great option for those who want a little more sound without breaking the bank. In terms of performance, the Cobalt exhaust offers modest gains, though not as significant as more expensive systems. Made from stainless steel with polished dual tips, it’s a solid choice for those on a budget, typically priced at $579.99.

Honorable Mentions

If you’re looking for more options, there are several other exhaust systems worth considering:

• Car Make Corn’s Ver-III Dual Tail Exhaust: Unique Japanese styling and an inline silencer for a balanced sound.
• Racing Beat Power Pulse Dual Exhaust: Known for its performance and aesthetic appeal.
• Magnaflow & Fujitsubo RM-01A: Both offer solid performance and sound profiles for those seeking a different style or sound.

Cheap NA Miata Exhaust Options

For those on a tighter budget, there are still plenty of options that deliver great sound and performance improvements without breaking the bank. One standout option is the Megan Racing Cat-Back Exhaust, priced at around $300. It offers a loud and aggressive exhaust note, though it does come with some compromises, such as increased cabin drone and lower-quality materials. However, it’s still a solid choice for budget-conscious enthusiasts who want to upgrade their Miata’s exhaust system.

Installation Tips for NA Miata Exhaust Systems

Installing an exhaust system on your Miata is a relatively straightforward process that many enthusiasts choose to do themselves. To help you out, here are some quick installation tips:

1. Tools You’ll Need: A jack, jack stands, a wrench set, penetrating oil, and a torque wrench are essential.
2. Lift the Car: Safely lift the car using a jack and jack stands. Ensure it’s stable before working underneath.
3. Remove the Old Exhaust: Spray the bolts with penetrating oil to help loosen them, then use a wrench to remove the old system.
4. Install the New Exhaust: Line up the new exhaust, bolt it in place, and ensure everything is tightly secured.
5. Check for Leaks: Once installed, start the car and listen for any exhaust leaks. If you hear any hissing, check the connections.

Proper installation can make a huge difference in performance and sound, so take your time and make sure everything is securely in place before hitting the road.