The Nissan 300ZX (Z32) remains one of the most iconic Japanese sports cars ever produced, largely thanks to its twin-turbocharged VG30DETT engine, advanced four-wheel steering, and timeless design. More than three decades after its debut, the 300ZX continues to be a favorite among enthusiasts seeking serious power and track capability. However, unleashing the full potential of this complex platform requires careful selection of performance parts from proven brands. In this expanded guide, we review three of the most respected names in the aftermarket—Apexi, HKS, and Greddy—and explore their key products for the 300ZX, along with installation considerations, tuning strategies, and real-world performance expectations.

Apexi: Precision Engine Management and Exhaust Flow

Apexi, founded in Japan in 1992, quickly built a reputation for producing high-quality engine management systems and exhaust components that emphasize precise control and measurable gains. For the 300ZX owner, Apexi offers a range of parts that work well both as standalone upgrades and as part of a comprehensive build.

Apexi Power FC and Commander

The Apexi Power FC is arguably the most popular standalone engine management unit for the Z32. It replaces the stock ECU with a fully programmable system that allows tuners to adjust fuel maps, ignition timing, boost control, and more. The optional Commander handset provides real-time monitoring and on-the-fly adjustments. Unlike piggyback systems, the Power FC directly controls injectors and ignition coils, giving it superior resolution and reliability. Many 300ZX owners pair the Power FC with larger injectors and upgraded fuel pumps to safely support 400–500 wheel horsepower. Apexi also offers the Power FC for naturally aspirated Z32s, making it a versatile choice across the model range.

Apexi N1 Exhaust and GT Spec Systems

The Apexi N1 Exhaust is a legendary cat-back system designed with a straight-through muffler and large-diameter piping to minimize back pressure. It produces a deep, aggressive tone while freeing up noticeable mid-range and top-end power. For those seeking even less restriction, Apexi’s GT Spec line uses a dual-canister design with titanium tips for weight reduction. Both systems are available in different piping sizes (typically 80mm or 90mm) to match various power levels. When combined with a downpipe and test pipes, the N1 exhaust can unlock substantial gains on a tuned VG30DETT.

Apexi Intake Filters and Induction Kits

Apexi’s high-flow air filters, particularly the Power Intake series, use a pleated cotton or foam element to increase airflow while maintaining filtration. Replacement induction kits often include a heat shield and ducting to draw cooler air from the front of the engine bay. On a stock 300ZX, this simple upgrade can improve throttle response and add a few horsepower, especially when combined with a larger intercooler. Apexi also offers the SAFC (Super Air Flow Converter)—a fuel-tuning computer that can trim the air/fuel ratio for lightly modified vehicles, though it has largely been superseded by modern standalone ECUs.

HKS: Engineering Excellence in Forced Induction and Management

HKS is one of the oldest and most respected names in Japanese performance, having been founded in 1973. Their product catalog for the 300ZX covers everything from exhaust and intakes to turbochargers and fully programmable engine management. HKS parts are known for their robust construction, scientific development, and compatibility with high-boost applications.

HKS Hi-Power Exhaust (formerly Super Drager)

The HKS Hi-Power Exhaust (previously called Super Drager) is a popular choice for 300ZX owners who want a sporty, distinctive sound without excessive drone. It uses a straight-through design with a large-diameter main pipe and a single or dual-tip muffler. HKS also offers the Legamax series for a quieter, more street-friendly tone. All HKS exhaust systems are mandrel-bent and constructed from stainless steel or titanium for durability and weight savings. On a tuned Z32, a full 3-inch HKS exhaust can reduce back pressure significantly, allowing the turbos to spool faster and produce more top-end power.

HKS F-Con V Pro and F-CON iS

The HKS F-Con V Pro is a sophisticated engine management system that offers features such as fuel and ignition mapping, boost control, knock control, and data logging. It is capable of handling high-horsepower builds with multi-stage injection and variable valve timing. For those with more modest goals, the HKS F-CON iS is a plug-and-play unit designed to work with stock sensors and injectors, providing a simpler tuning path. Both systems require professional mapping on a dynamometer, but they give the tuner complete control over the engine’s behavior. HKS also sells a range of supporting products, including the EVC (Electronic Valve Controller) boost controller, which allows the driver to adjust boost pressure from the cabin.

HKS Intercooler and Turbo Upgrades

Reducing intake air temperature is critical on a turbocharged 300ZX. The HKS Intercooler Kit replaces the restrictive stock side-mount intercoolers with a larger front-mount unit (or upgraded side-mounts in some iterations). This kit improves flow and reduces pressure drop, helping the turbos produce more power and reducing the risk of detonation. HKS also manufactures complete GT Series turbocharger upgrades for the VG30DETT. The GT2530, GT2835, and GT3037 are common choices that pair well with the F-Con V Pro and larger injectors. These turbos spool quickly and can support power levels from 400 to 600 wheel horsepower depending on size and supporting modifications.

Greddy (Trust): Japanese Performance with Italian Flair

Greddy is the overseas marketing name for Trust, a Japanese company founded in 1977. Greddy parts are known for their striking design—often using titanium and polished stainless steel—and for offering complete turbo kits that simplify the upgrade process for 300ZX owners. The brand also produces a wide array of intake, intercooler, and engine management solutions.

Greddy Ti-C Exhaust and Gracer Systems

The Greddy Ti-C Exhaust is a lightweight, single-canister cat-back system with a titanium muffler and carbon fiber tip. It saves significant weight over a steel exhaust and produces a high-pitched, aggressive note. The Greddy Gracer system offers a more subtle appearance with a brushed stainless finish. Both exhausts are designed for maximum flow and are offered in 80mm and 90mm piping sizes. Many owners consider the Ti-C the aesthetic benchmark for 300ZX exhausts, though its volume can be loud on long highway drives. For a quieter option, Greddy’s Evolution GT line uses a dual-canister layout that reduces drone while still flowing well.

Greddy E-Manage Ultimate and Blue

The Greddy E-Manage Ultimate is a piggyback engine management system that intercepts signals from the stock ECU and modifies them for fuel and ignition timing. Unlike earlier E-Manage Blue units, the Ultimate version offers more tuning resolution, additional inputs/outputs, and the ability to control boost through a separate solenoid. While not as powerful as a standalone ECU, the E-Manage Ultimate is an excellent choice for 300ZX owners with moderate modifications (e.g., exhaust, intercooler, boost increase) who want to retain the stock ECU’s drivability. Many tuners appreciate its user-friendly software and affordability.

Greddy Turbo Kits and Upgraded Intercooling

Greddy is famous for its complete turbo kits that bolt onto the 300ZX with minimal fabrication. The Greddy TD04HL-18T kit is a popular 400–450 wheel horsepower upgrade that uses a pair of Mitsubishi-based turbos. Larger options, such as the TD06SH-25G kit, can push power to 700+ wheel horsepower with proper fueling and tuning. Greddy also offers front-mount intercooler kits, blow-off valves (the RS and Type-S), and oil catch cans designed specifically for the Z32. Their intercooler cores often use a bar-and-plate design that resists heat soak better than tube-and-fin cores, making them ideal for track use.

Comparing the Three Brands for the Nissan 300ZX

Choosing between Apexi, HKS, and Greddy often comes down to personal preference, budget, and specific performance goals. Here is a breakdown of how they compare across key factors:

  • Engine Management: Apexi’s Power FC is the most popular standalone for the 300ZX due to its simple interface and wide tuner familiarity. HKS’s F-Con V Pro offers more advanced features for extreme builds. Greddy’s E-Manage Ultimate is a cost-effective piggyback for mild upgrades.
  • Exhaust Systems: Apexi N1 strikes a balance between volume and flow. HKS Hi-Power is known for its refined tone and build quality. Greddy Ti-C is the lightest and most aggressive in sound.
  • Turbo Upgrades: HKS and Greddy both offer comprehensive turbo kits, but Greddy’s kits are often easier to install as they include everything needed. Apexi focuses more on engine management and exhaust rather than full turbo systems.
  • Intercoolers: HKS and Greddy front-mount kits are both highly effective, with Greddy often priced slightly lower. Apexi does not offer a dedicated intercooler for the 300ZX.
  • Price and Availability: All three brands are widely available through specialty retailers such as Z1 Motorsports and Concept Z Performance. Generally, Apexi and Greddy parts are more affordable than HKS for equivalent performance levels.

Building a Performance 300ZX: Combinations and Strategies

Many owners choose to mix parts from different brands to achieve their ideal setup. A common recipe for a reliable 450–500 wheel horsepower street car includes:

  • Apexi Power FC and Commander for engine management.
  • HKS GT2530 turbos with the HKS intercooler kit.
  • Greddy Ti-C exhaust with Greddy downpipes and test pipes.
  • Injectors (740cc or 1000cc) and a high-flow fuel pump from brands like DeatschWerks or Walbro.
  • A boost controller—either HKS EVC or Greddy Profec.

This combination gives the driver a responsive, powerful car that can be tuned safely on pump gas. For a more budget-oriented build, the Apexi Power FC paired with Greddy’s TD04HL-18T turbo kit and a cat-back exhaust delivers excellent value without sacrificing reliability. Always ensure that the supporting mods—fuel system, intake, and cooling—are addressed before increasing boost significantly.

Installation and Tuning Considerations

Installing performance parts on a 300ZX is not for the faint of heart. The engine bay is extremely tight, and many components (such as the turbos and intercooler pipes) require hours of labor. It is highly recommended to work with a shop that specializes in Z32s, such as those in the community on 300ZXClub. Proper tuning is essential: even the best hardware will perform poorly or fail if the air-fuel ratios and ignition timing are not dialed in on a dyno. Standalone ECUs like the Power FC or F-Con V Pro require a skilled tuner who understands the VG30DETT’s characteristics.

Supporting modifications often overlooked include upgrading the cooling system (larger radiator, electric fans), reinforcing the transmission (especially on high-torque builds), and addressing the aging rubber hoses and wiring. The 300ZX’s advanced electronics can be sensitive to voltage spikes, so a quality battery and grounding kit are wise investments. Always use fresh spark plugs (e.g., NGK Iridium) and check boost leaks after every installation.

Conclusion

The Nissan 300ZX rewards owners who choose quality parts and invest in proper tuning. Apexi, HKS, and Greddy each bring unique strengths to the table: Apexi excels in accessible engine management, HKS offers engineering depth in forced induction, and Greddy delivers complete, bolt-on kits with striking aesthetics. By understanding the nuances of these brands and planning a build that matches your goals and budget, you can transform a stock 300ZX into a reliable, exhilarating performance machine. Before purchasing, research compatibility with your specific model year and consult experienced Z32 owners—the online community is a valuable resource that can save time and money.