Understanding the G37 and Nismo Relationship

Contrary to common belief, Infiniti never produced a factory G37 Nismo model. Nissan’s Nismo division—Nissan Motorsports International—focuses on high-performance tuning, motorsport parts, and limited-edition models. While the G35 received a Nismo variant, the G37 never did. Instead, Infiniti offered genuine Nismo performance parts through its dealers and accessories catalog, allowing G37 owners to upgrade their cars with engineering that meets factory standards. These parts are designed to enhance power, handling, and aesthetics while maintaining the reliability expected from a luxury sports coupe or sedan. This article explores the genuine Nismo parts available for the Infiniti G37, their pricing, performance gains, and how they compare to aftermarket alternatives.

Key Nismo Performance Upgrades for the G37

The following sections break down the major categories of Nismo factory performance enhancements for the G37. Each part is engineered using motorsport-derived technology, often incorporating materials and designs from Nissan’s racing programs.

Engine Tuning and ECU Upgrades

Nismo engine tuning for the G37 focuses on optimizing the VQ37VHR V6 engine. Factory Nismo ECU reflashes are rare, but Nismo-branded performance modules have been available through Infiniti dealers. These modules alter ignition timing, air-fuel ratios, and throttle response to unlock approximately 10–15 extra horsepower while staying compliant with emissions. The stock engine produces 330 hp and 270 lb-ft of torque; a Nismo tune can push output closer to 345 hp. Note that Nismo no longer sells a standalone ECU for the G37, but used units occasionally appear on forums and specialty retailers. Pricing for a used Nismo ECU flash ranges from $600 to $1,000, depending on condition and version.

Intake and Exhaust Systems

Nismo cold air intake systems for the G37 feature a carbon-fiber intake tube and a high-flow cotton filter, replacing the restrictive factory box. The design reduces intake air temperature and increases airflow by up to 20 percent. A true Nismo intake kit retails for approximately $500–$700 (discontinued, but new old stock found online). On the exhaust side, Nismo offers a cat-back exhaust cat back with polished stainless steel construction, mandrel-bent tubing, and a distinctive dual-tip muffler with laser-etched Nismo logo. The system reduces back pressure, saves weight (about 8 lbs), and delivers a deeper, more aggressive exhaust note. Expect to pay $1,200–$1,800 for a complete cat-back system, though prices vary by retailer. For optimal gains, pair the intake and exhaust with a Nismo or aftermarket tune.

Suspension and Chassis

Nismo suspension components for the G37 include sport springs, dampers, and stabilizer bars designed to lower the car approximately 15–20 mm while increasing spring rates by 30 percent. The result is flatter cornering, reduced body roll, and improved steering response. A full Nismo suspension kit (springs, shocks, and sway bars) costs about $1,000–$1,500 for parts alone. Notably, Nismo also offers a strut tower brace for the G37 coupe and sedan, reducing chassis flex under hard driving. The brace is machined from aircraft-grade aluminum and carries a price tag of $300–$400. These parts are ideal for drivers who want OEM-level durability without sacrificing ride comfort.

Braking System

Nismo upgraded brake pads use a high-friction compound that provides better bite and fade resistance compared to stock pads. They are designed for street and occasional track use. A set of Nismo front brake pads typically costs $250–$400; rear pads run slightly less. For serious stopping power, Nismo also sells larger-diameter rotors (two-piece floating design) and braided stainless steel brake lines. A complete Nismo big brake kit (if found used or NOS) can exceed $3,500, but individual rotor and pad upgrades are more accessible. Pair with high-performance brake fluid (e.g., Motul RBF600) for best results.

Wheels and Tires

Nismo lightweight alloy wheels for the G37 are forged from ultra-strong aluminum, reducing unsprung weight by approximately 5–7 lbs per wheel compared to factory G37 wheels. The typical Nismo wheel size is 19x9 inches front and 19x10 inches rear, wrapped in high-performance tires like Yokohama Advan Sport. A complete set of four Nismo forged wheels (new) costs $2,000–$3,000; used sets fetch $1,200–$1,800. These wheels not only improve acceleration and braking response but also give the car a more aggressive, race-inspired stance. Nismo wheel center caps and lug nuts can be purchased separately for about $50–$100.

Aerodynamics and Styling

Nismo offers a small catalog of exterior accessories for the G37, including a carbon-fiber front lip, side skirts, and a rear spoiler. These parts are made from lightweight materials and designed to fit perfectly with the factory body lines. The front lip helps reduce lift at high speeds and adds a visual edge. A Nismo front lip spoiler typically costs $400–$600; the rear spoiler runs $300–$500. Also available is the Nismo shift knob (leather and Alcantara), steering wheel trim, and floor mats—interior upgrades that complement the performance focus.

Pricing and Availability

Genuine Nismo parts for the Infiniti G37 have been largely discontinued by Infiniti and Nismo as production ended over a decade ago. However, new old stock (NOS) can still be found through online retailers, specialty shops, and enthusiast forums. Reputable sources include Z1 Motorsports, CZT Performance, and the official Nismo Parts website (which occasionally lists legacy items). Used parts in good condition can save 30–50 percent off retail, but buyers should verify authenticity by checking part numbers (typically starting with “G37” or “NIS”). Below is a summary of average prices across major component categories:

  • ECU Tune (used): $600–$1,000
  • Cold Air Intake: $500–$700
  • Cat-Back Exhaust: $1,200–$1,800
  • Suspension Kit (springs/shocks): $1,000–$1,500
  • Strut Tower Brace: $300–$400
  • Brake Pads (front set): $250–$400
  • Forged Wheels (set): $2,000–$3,000
  • Carbon-Fiber Lip Spoiler: $400–$600

Prices are for new parts where available; used prices can be substantially lower. Always inspect used parts for damage or excessive wear.

Benefits of Choosing Genuine Nismo Parts

Opting for factory Nismo components offers distinct advantages over generic aftermarket parts:

  • Engineered Fitment: Every Nismo part is designed specifically for the G37 chassis, using original CAD data. This ensures bolt-on installation without modification.
  • Quality Control: Nismo parts undergo rigorous testing to meet Nissan’s durability standards. They often use higher-grade materials than the base factory parts.
  • Preserved Driving Character: Nismo upgrades enhance performance without sacrificing the G37’s refined ride quality and low noise levels.
  • Resale Value: Many buyers seek vehicles with genuine Nismo parts, especially rare pieces like the forged wheels or intake. An honest, well-documented Nismo build can command a premium (5–10 percent higher resale).
  • Warranty Considerations: Genuine Nismo parts purchased through Infiniti dealers historically carried a factory warranty (though now expired). They also reduce the risk of voiding other factory coverage compared to non-OEM modifications.

However, availability is the biggest drawback. If you cannot locate a specific Nismo part, a high-quality aftermarket alternative may be necessary.

Installation Considerations

Installing Nismo parts on a G37 is generally straightforward for those with moderate mechanical skills. The intake and exhaust systems can be installed with basic hand tools and a jack, while suspension components may require a spring compressor and alignment afterward. Brake pad swaps are simple; however, bleeding the system with new fluid is recommended. For ECU tuning, professional installation is advised if you purchase a used Nismo module, as improper wiring can damage the powertrain control module. Expect labor costs of $200–$500 for suspension installation at an independent shop, and $100–$200 for intake/exhaust. If you do the work yourself, follow factory torque specifications and use thread-locker where indicated. After installation, a dyno tune is optional but can further optimize air-fuel ratios for the new components. Many G37 owners report peak gains of 25–35 wheel horsepower when combining intake, exhaust, and a proper tune—roughly a 10–12 percent improvement over stock.

Comparing Nismo vs Aftermarket Performance Parts

The aftermarket world offers countless alternatives for the G37, from name brands like Stillen, Fast Intentions, and HKS to generic eBay components. Here is how genuine Nismo stacks up:

  • Cost: Nismo parts are typically 20–50 percent more expensive than aftermarket equivalents. For example, a Stillen cat-back costs around $1,000 versus Nismo’s $1,500.
  • Performance Gains: Aftermarket parts often claim higher horsepower numbers, but real-world testing shows Nismo parts consistently deliver within 5–10 hp of the best aftermarket brands, with superior driveability and NVH characteristics.
  • Build Quality: Nismo’s use of lightweight forgings and premium materials matches or exceeds many aftermarket offerings. Cheaper parts may rust, crack, or degrade faster.
  • Fitment: Aftermarket parts sometimes require trimming, grinding, or shimming to fit perfectly. Nismo parts drop right on—a significant time-saver.
  • Aesthetics: Nismo parts look like they belong, with subtle branding and a clean design that complements the G37’s luxury image. Some aftermarket parts appear overly aggressive or out of place.

For the enthusiast who values authenticity, OEM-level fit, and peace of mind, Nismo is the clear winner. If budget is tight or maximum power is the goal, aftermarket may be more practical. Many owners mix Nismo suspension and wheels with aftermarket intake/exhaust to balance cost and performance.

Real-World Performance Gains

To understand the impact of Nismo parts, we compiled data from owner reviews, forum discussions, and independent dyno charts (e.g., from MyG37). A G37 coupe equipped with Nismo intake, exhaust, and a tune can achieve roughly 345–350 crank horsepower, up from 330. On the dyno, this translates to about 285–295 wheel horsepower (compared to 270 stock). Quarter-mile times drop from around 13.6 seconds to 13.1–13.2 seconds. With Nismo suspension and sticky tires, a 60-foot time of 1.8 seconds is attainable. Braking distance from 60–0 mph improves by 5–8 feet with Nismo pads and performance fluid. These gains are modest compared to a supercharger kit, but they preserve daily drivability and fuel economy within 1–2 mpg of stock. For most G37 owners, the combination of Nismo parts delivers a balanced, rewarding driving experience that feels like an OEM performance variant—even if the factory never built one.

Conclusion

The Infiniti G37 remains one of the most capable and luxurious sports coupes/sedans of its era, and genuine Nismo parts allow owners to extract even more performance while maintaining the integrity of the original design. From the lightweight forged wheels and sport-tuned suspension to the refined intake and exhaust systems, each component is built to the highest standards. While availability is limited and pricing can be high, the investment pays off in driving engagement, resale value, and the satisfaction of owning a piece of Nissan’s motorsport heritage. Whether you are building a weekend track toy or a refined daily driver, exploring Nismo’s catalog is the first step toward realizing your G37’s full potential. For further details and part numbers, consult the official Nismo parts section or reputable specialists like Z1 Motorsports.