The Nissan 370Z is a drivers car in the truest sense, a front-engine, rear-wheel-drive sports coupe that rewards the enthusiast with sharp handling and a naturally aspirated VQ37VHR V6 that loves to rev. For many owners, the first and most satisfying modification is an aftermarket exhaust system. Swapping the restrictive factory muffler and piping opens up the engine's breathing, wakes up the iconic VQ growl, and sheds significant weight. However, the market is saturated with options ranging from subtle single-tip systems to aggressive dual-cannon setups. This guide expands on the key players, the engineering behind their designs, and the real-world tradeoffs to help you choose the ideal exhaust for your 370Z.

Understanding Exhaust System Architecture for the 370Z

Before diving into brand comparisons, it is essential to understand the different types of exhaust systems available for the 370Z. The factory exhaust is a single-piece collector-back system that routes through restrictive mufflers. Aftermarket options break this down into distinct configurations:

  • Axle-Back Systems: These replace the rear mufflers and tailpipes from the axle-back flange. They are the simplest to install and offer the most dramatic sound change per dollar spent. Performance gains are minimal, typically 3-5 horsepower, but the weight savings over the stock boat-anchor mufflers are significant.
  • Cat-Back Systems: This is the most popular upgrade. It replaces everything from the catalytic converters to the exhaust tips. Cat-back systems optimize pipe diameter (typically 2.5 to 3.0 inches) and routing for improved exhaust flow. Expect gains of 8-15 wheel horsepower on a stock engine, along with a deeper, more aggressive tone.
  • Header-Back or Full Exhaust Systems: These replace the exhaust manifolds (headers), catalytic converters (test pipes or high-flow cats), and the entire cat-back section. A full system yields the most substantial power gains, often 20-30 horsepower, but dramatically increases volume and requires tuning or O2 sensor spacers (defoulers) to prevent a check engine light.

When reading brand literature, clearly identifying whether a system is axle-back, cat-back, or header-back is the first step in narrowing your choices.

Top Aftermarket Exhaust Brands for the Nissan 370Z

Each brand brings a distinct engineering philosophy, material strategy, and sonic signature. Below is an expanded look at the major players and what sets them apart.

Nismo Exhaust System

As Nissan's in-house performance division, Nismo designs its exhausts to complement the factory warranty and tuning strategy. The Nismo cat-back for the 370Z is a stainless steel system with dual-wall, large-diameter tips that exit through the factory rear diffuser cutouts. The sound is understated by aftermarket standards—a deep, bassy note at idle with a smooth, refined roar under full throttle. It is nearly drone-free on the highway. Performance gains are modest (approximately 5-8 horsepower), as Nismo prioritizes driveability and emissions compliance over outright volume or peak power. Fitment is absolutely flawless, making it a true "no-hassle" upgrade for the daily driver who wants OEM+ quality.

HKS Exhaust System

HKS is a giant in Japanese performance tuning, and their exhausts for the 370Z are engineered with motorsport experience. The HKS Legamax Premium and Hi-Power Spec L are the most popular models. The Legamax Premium uses a single large silencer with a polished finish and produces a deeper, more mature tone with minimal interior resonance at cruising speeds. The Hi-Power Spec L uses a straight-through, high-flow design that is significantly louder and more aggressive. HKS systems are noted for excellent build quality and a distinctive, authoritative exhaust note that does not sound raspy. They often use a combination of stainless steel piping with titanium or carbon fiber tips, depending on the variant. Horsepower gains are in the 8-12 range on a properly tuned car.

Invidia Exhaust System

Invidia has carved out a reputation for providing aggressive sound at a competitive price point. Their Q300 cat-back system for the 370Z is one of the most popular aftermarket exhausts on the market. The Q300 uses a twin-loop muffler design with internal Helmholtz chambers to reduce drone while maintaining a loud, growling exterior tone. It is louder than the Nismo and HKS Legamax, with a pronounced throttle burble and crackle on deceleration. Invidia also offers the Gemini cat-back, which uses a single-pipe design for a lower-profile sound. Key features include mandrel-bent 304 stainless steel piping, CNC-machined flanges, and polished tips. The Q300 is a fantastic choice for the owner who wants their 370Z to sound unmistakably aggressive without being obnoxious inside the cabin.

Akrapovic Exhaust System

Slovenian manufacturer Akrapovic is the gold standard for lightweight, high-performance exhausts. Their 370Z system is typically constructed from grade-1 titanium with a carbon fiber tip, weighing nearly half of the factory steel unit. Akrapovic uses a sophisticated muffler with internal baffles that produce a deep, refined, and even aristocratic exhaust note—never raw or uncouth. The power gains are real, often 10-15 horsepower on a cat-back system, thanks to optimal exhaust flow dynamics. The sound is louder than OEM but remains civilized at cruising speeds. The primary drawback is cost: Akrapovic systems are among the most expensive on the market. However, for the owner seeking the ultimate combination of weight reduction, performance, and exotic sound, the premium is justified.

Stillen Exhaust System

Stillen is a respected US-based aftermarket company with a long history with Nissan platforms. Their exhaust for the 370Z uses a patent-pending "Resonate Chamber" design that eliminates drone while maintaining a deep, muscle-car-like tone. The system is crafted from 304 stainless steel with polished tips and features a unique four-tip exit through the factory diffuser, giving a filled, symmetrical look. Stillen systems are among the easiest to install, with a direct bolt-on design and good ground clearance. Sound profile is deep and muscular without the high-frequency rasp some competitors exhibit. Drone suppression is a standout feature, making the Stillen an excellent choice for a daily driver that sees highway commuting. Expect 8-10 horsepower gains.

Other Notable Mentions

Fast Intentions (FI): Known for their customizable cat-back systems with multiple muffler options (quiet, smooth, aggressive, race). FI offers a unique single-pipe-over-axle design that is lightweight and produces a very distinctive, exotic V6 note. Their "resonated" test pipes are also legendary for making the VQ sound like a Ferrari. AAM Competition (AAM): Their Competition cat-back is one of the loudest and most aggressive options available, featuring massive 3-inch piping and straight-through mufflers. It is a dedicated race system known for its raw, untamed sound. ARK Performance: ARK's grip exhaust for the 370Z uses a dual-walled, angled tip design with helix-bored internal technology for a smooth, deep tone with zero drone. Their systems are known for high-quality welds and a unique wide-band sound.

Key Performance Metrics to Evaluate

Choosing an exhaust goes beyond brand preference. Consider these objective metrics:

  • Horsepower and Torque Gains: Look for dyno charts that show gains across the entire RPM range, not just peak. A good cat-back should add torque in the mid-range (3000-5000 RPM) where you drive most often.
  • Weight Savings: Factory 370Z exhausts are notoriously heavy, often over 50 pounds. A titanium system can save 25-30 pounds, a high-quality stainless steel system saves 15-20 pounds. This is unsprung weight that improves both acceleration and handling.
  • Drone Management: Drone is a low-frequency resonance that occurs in the 2000-3000 RPM range during highway cruising. Helmholtz chambers, resonators, and specific muffler designs mitigate this. Read owner reviews carefully—what sounds acceptable on a test drive can become fatiguing on a road trip.
  • Fitment and Ground Clearance: Some aftermarket systems, particularly those with large piping or aggressive routing, can hang lower than stock and scrape over speed bumps. Check owner forums for fitment reports specific to your year of 370Z.

Material Science: Stainless Steel vs Titanium vs Inconel

The material choice affects weight, cost, sound character, and longevity.

  • 304 Stainless Steel: The industry standard. It is corrosion-resistant, durable, and offers a balanced sound profile. Most cat-back systems use T304 stainless, which is easy to weld and polish. It is the best value for daily drivers in all climates.
  • Titanium (Grade 1 or 2): Significantly lighter than steel (around 40% lighter) and develops a unique golden-blue discoloration over time with heat. Titanium produces a higher-pitched, more exotic sound with a longer decay. It is expensive and difficult to repair. Ideal for track-focused or weight-conscious builds.
  • Inconel: Used in extreme motorsport applications (F1, NASCAR). It can withstand incredibly high temperatures and is extremely strong but is very expensive and heavy. Overkill for a street 370Z.
  • Aluminized Steel: Cheaper than stainless but prone to rust over time, especially in areas with road salt. Avoid for a long-term street car.

Sound Profiles and Acoustics

The 370Z's VQ37VHR engine has a characteristic metallic rasp when pushed hard. Aftermarket exhausts primarily shape this sound through muffler design, pipe diameter, and the inclusion of an H-pipe or X-pipe crossover. Systems with larger diameter piping (3-inch vs 2.5-inch) tend to sound deeper but can lose some velocity, potentially reducing low-end torque if not matched to supporting mods. Helmholtz resonators are used to cancel specific frequencies that cause drone, while straight-through mufflers (like Magnaflow) produce a more open, aggressive sound. Chambered mufflers (like Flowmaster) give a deeper, more muscle-car tone. For the 370Z, a system that balances a deep idle with a scream at redline is generally preferred. Listen to multiple sound clips with good quality headphones before committing. A 30-second clip cannot fully convey drone, but it can give you a sense of personality.

Budgeting Your Exhaust Upgrade

Axle-back systems for the 370Z typically range from $400-$800. Full cat-back systems span from $900 (Invidia Q300) to over $2500 (Akrapovic Titanium). Installation costs vary: a professional shop might charge $150-$300 for a cat-back install, but this is a very DIY-friendly job if you have jack stands, a socket set, and penetrating oil for the stubborn factory bolts. Factor in potential additional costs: new gaskets, replacement exhaust hangers, or an exhaust shop for minor alignment adjustments. Do not forget tuning costs if you install headers or test pipes—a proper tune ensures you realize the full power potential and avoid a check engine light.

The 370Z is subject to federal EPA regulations and, in many states, California Air Resources Board (CARB) standards. Removing catalytic converters is illegal for street use in all 50 states. Cat-back systems are generally considered legal because they do not modify emission-control components. However, noise ordinances vary by locality. Some aftermarket systems exceed typical street noise limits (designed to be under 95 dB). If you live in an area with strict noise enforcement, or if you commute through neighborhoods, consider a system with interchangeable silencers (like Fast Intentions provides) to keep the peace. After a performance exhaust, your 370Z will pass a visual safety inspection in most areas, but an emissions sniffer test will require the factory catalytic converters to be intact.

Installation Tips for the 370Z

The VQ37VHR engine sits longitudinally, and the exhaust system runs symmetrically under the tunnel. Common challenges during installation include heat-soaked bolts on the rear muffler hangers and the weight of the factory unit. Using a penetrating spray (like PB Blaster) a day before install is recommended. Unbolt the rear section first, then the mid-pipe. A floor jack can help support the heavy factory mufflers. Aftermarket systems should bolt up without modification; if alignment is off, loosen all clamps and hangers, adjust the tips, and tighten from front to back. A gap of roughly 3/8 inch between the bumper cutout and exhaust tip allows for heat expansion without contact. Always use a new gasket at the flange connection to the catalytic converters.

Final Verdict: Choosing the Right Exhaust for Your Build

There is no single "best" exhaust for the Nissan 370Z—only the best exhaust for your specific goals and tolerance for noise. For the enthusiast who values OEM refinement and a perfect fit, the Nismo system is the ideal factory-plus upgrade. Drivers seeking a rich, aggressive tone without cabin fatigue should look to the Invidia Q300 HFC or the Stillen Resonate system. Track-day warriors who prioritize weight savings and exotic acoustics will be drawn to the Akrapovic titanium system. And those who want the loudest, most aggressive street presence will find a home with AAM Competition or a race muffler setup from Fast Intentions. Regardless of your choice, upgrading the exhaust on your 370Z is one of the most rewarding modifications you can make. It transforms the driving experience every time you turn the key, connecting you to the engine's character in a way no other single part can. Take your time, listen to multiple options, and invest in a system that makes you smile every time you press the starter button.