The Mitsubishi 3000GT, known domestically as the GTO, remains a landmark of 1990s Japanese automotive engineering. It arrived packed with technology that still impresses today: active aerodynamics, all-wheel drive, four-wheel steering, and a twin-turbocharged 3.0-liter V6. While the car was a heavyweight in every sense, its potential for performance was immense. For enthusiasts looking to unlock that potential, three aftermarket manufacturers have consistently delivered the parts required to transform the 3000GT from a grand tourer into a genuine performance weapon: HKS, GReddy, and Blitz.

Understanding what each brand offers and how their components work together is essential for any 3000GT owner. This guide provides an authoritative look at the best parts from these three titans of JDM tuning, covering turbo systems, engine management, exhausts, suspension, and the supporting modifications required to build a reliable, high-horsepower machine.

HKS: Precision Engineering for Maximum Output

HKS has been synonymous with Japanese performance tuning since the 1970s. For the 3000GT, their lineup represents the pinnacle of precision engineering. HKS parts are designed for those who demand the highest level of fitment and performance without compromise. The brand is particularly known for its turbo technology, exhaust systems, and sophisticated engine management solutions.

HKS Turbo Kits and Forced Induction

The 6G72 engine responds well to increased boost, but the stock turbos on the VR-4 are a limiting factor. HKS offers several upgrade paths. The HKS GT-RS kit is a popular choice for street-driven cars looking for quick spool and solid gains to the 400-450 wheel horsepower range. For those chasing higher numbers, the HKS T51R SPL kit is a monster, capable of supporting over 700 horsepower. These kits use high-quality cast iron or stainless steel manifolds that resist cracking better than cheaper alternatives.

  • HKS GT-RS Turbo Kit: Excellent spool characteristics, bolt-on compatibility with minor modifications, ideal for pump gas.
  • HKS T51R SPL Kit: Large single turbo conversion, massive top-end power, requires extensive supporting modifications.
  • HKS Wastegate & Blow Off Valves: HKS Racing BOV (Super SQV) is an industry standard for reliable boost venting.

Exhaust and Induction Systems

HKS exhausts are engineered for maximum flow with a focus on weight reduction. The HKS Hi-Power Exhaust utilizes a straight-through design with a massive cannon-style muffler, producing the deep, distinct tone that 3000GT owners love. The HKS Carbon Titanium exhaust offers the same performance with a weight savings over stainless steel. On the intake side, the HKS Racing Suction Intake provides a dramatic increase in intake sound and airflow, crucial for supporting larger turbos.

Engine Management Solutions

Tuning is where HKS truly shines. The HKS F-CON V Pro is a fully programmable standalone engine management system. While it requires skilled tuning, it allows complete control over fuel maps, ignition timing, boost control, and even VTEC if retrofitted. For owners wanting a simpler plug-and-play solution, HKS also offers the F-CON iS, which piggybacks onto the stock ECU to adjust fuel and ignition curves safely. Pairing an HKS turbo kit with an F-CON V Pro is the gold standard for a serious 3000GT build.

Explore HKS's current turbo kit offerings for high-performance builds.

GReddy: Proven Reliability for Street and Strip

GReddy, the North American arm of Trust Co., Ltd., has a long history with the 3000GT platform. Their philosophy emphasizes proven performance and reliability. GReddy parts are often the first recommendation for owners new to modifying their 3000GT because the engineering is robust and the support is well-documented. They offer comprehensive system upgrades rather than just standalone parts.

The Legendary GReddy TD06-20G Turbo Kit

The GReddy TD06-20G kit is arguably the most famous turbo upgrade for the Mitsubishi 3000GT VR-4. It provides a perfect balance of power and drivability. The TD06 turbine wheel flows significantly more exhaust gas than the stock turbos, spooling quickly and pulling hard to redline. GReddy’s cast iron manifolds are known for their durability, and the kit includes everything needed for installation, including oil lines and gaskets. This kit is a reliable path to 450-550 wheel horsepower.

  • GReddy TD05-16G: Faster spool than the TD06, good for quick street response and moderate power gains (350-400whp).
  • GReddy TD06-20G: The sweet spot for a street/strip car, excellent mid-range and top-end power.
  • GReddy TD07-25G: Larger frame turbo for dedicated high-horsepower builds.

Intercooling and Cooling Systems

Heat is the enemy of the 6G72 engine. GReddy addresses this with their large capacity intercoolers. The GReddy 2-Row Intercooler is a direct fit upgrade over the stock side-mounts, significantly reducing intake air temperatures. For extreme builds, GReddy also produced front-mount intercooler kits that reposition the cooling core for maximum airflow. Additionally, GReddy oil coolers are essential for track-driven cars to maintain optimal oil temperatures.

Suspension and Drivetrain Upgrades

GReddy understands that power is useless without control. The GReddy Type S Coilover System offers adjustable damping and ride height, transforming the 3000GT's handling. These coilovers eliminate the floatiness of the stock suspension while maintaining a compliant ride for daily driving. GReddy also produces heavy-duty drivetrain components, such as differential mounts, to handle the increased torque from their turbo kits.

View GReddy's turbo system lineup for the 6G72 platform.

Blitz: Intelligent Electronics and JDM Style

Blitz carved its reputation in the 1990s by producing high-quality electronics and visually striking performance parts. For the 3000GT, Blitz offers specific advantages, particularly in the areas of boost control, exhaust technology, and data monitoring. Blitz products are perfect for the owner who wants both functionality and visual appeal under the hood.

Precision Boost Control

The 3000GT’s stock boost control system is adequate, but aftermarket control unlocks its true potential. The Blitz SBC i-Color (Spec R) is a powerful electronic boost controller that uses a solenoid to regulate wastegate pressure with incredible accuracy. It offers multiple boost profiles, gear-based boost control, and a vibrant display. For a simpler, reliable setup, the Blitz Dual SBC is a proven classic. Proper boost control is critical for keeping the 6G72 engine safe while maximizing power.

  • Blitz SBC i-Color Spec R: Full-color display, stepper motor control, data logging.
  • Blitz Dual Drive BOV: Adjustable recirculating/blow-off valve, ideal for MAF-based 3000GTs.
  • Blitz Power Meter iD: Measures horsepower, torque, G-force, and quarter-mile times.

Exhaust Technology and Induction

The Blitz Nur-Spec R exhaust is legendary for its "real JDM" sound and aggressive design. It uses a straight-through layout with a large-tipped muffler. The Blitz LM Air Filter uses a distinctive metal mesh construction that provides excellent filtration and airflow, offering a unique aesthetic under the hood. Blitz exhaust systems are constructed from high-grade stainless steel and tig-welded for longevity.

Monitoring and Vehicle Protection

Blitz excels in driver information. The Blitz DTT DC3 III Turbo Timer is an industry standard, allowing the turbo to cool down after hard driving. Blitz also offers a full line of gauges (boost, oil pressure, EGT) that match the styling of the 3000GT interior perfectly. Their focus on durability makes them a favorite for daily-driven modified cars.

Check Blitz North America for current electronics and exhaust offerings.

Building a Complete System: Fuel, Drivetrain, and Cooling

Installing a turbo kit from HKS, GReddy, or Blitz is only part of the equation. The 3000GT requires substantial supporting modifications to handle the increased power reliably. Ignoring these systems can lead to detonation, transmission failure, and overheating. A cohesive build plan is mandatory.

Fuel System Upgrades

The stock fuel pump and injectors max out around 400 crank horsepower. For any turbo upgrade, upgrading the fuel system is the first step.

  • Fuel Pump: A Walbro 255lph in-tank pump is the standard replacement. For E85, a 400lph pump is recommended.
  • Injectors: Precision 650cc or 750cc injectors are perfect for 450-550whp builds. ID1300cc injectors are needed for E85 setups above 600whp.
  • Fuel Pressure Regulator: An Aeromotive or AEM adjustable FPR ensures consistent fuel delivery.

Drivetrain and Clutch

The Getrag 6-speed manual transmission in the VR-4 is strong, but the clutch is a weak point. A single or twin-disc clutch from ACT or South Bend Clutch is essential. A lightweight flywheel (11-13 lbs) helps the engine rev freely, improving throttle response significantly. Upgraded axles and differential mounts are recommended for cars launching hard on slicks.

Cooling and Heat Management

The 3000GT is notorious for engine bay heat. Upgrading to an aluminum radiator (Fluidyne, Mishimoto) is a crucial reliability mod. Adding a transmission cooler and power steering cooler extends the life of these systems. Functional hood vents or a Sleeve kit for the stock hood can dramatically reduce under-hood temperatures, preventing heat soak during summer driving.

Sourcing Parts and Getting a Professional Tune

Finding authentic parts requires knowledge. Specialized vendors like 3SX Performance and the 3SI community forum are excellent resources for sourcing new and used components. It is critical to avoid counterfeit parts, especially turbochargers and fuel management components. Authentic HKS, GReddy, and Blitz parts carry serial numbers and come with specific packaging.

Once the parts are installed, professional tuning is non-negotiable. A good tuner will dial in the air/fuel ratios, ignition timing, and boost curve using a standalone ECU like the HKS F-CON V Pro, AEM Infinity, or a chipped stock ECU with a Mapecu or EvoScan setup. A safe, conservative tune on pump gas protects the engine and ensures the car drives well on the street.

Unlocking the Legend: Building Your 3000GT

The Mitsubishi 3000GT is not the easiest car to modify, but the rewards are immense when it is done right. Brands like HKS, GReddy, and Blitz provide the engineering foundation needed to build a car that delivers performance, reliability, and that unmistakable JDM character. Whether you are looking for a 400-wheel-horsepower street car that can hang with modern machinery or a 700-horsepower track monster, the parts from these manufacturers have been tested and proven for decades.

Start with a clear goal, choose your parts wisely, and never cut corners on installation and tuning. The 3000GT community is strong, and the knowledge base is vast. By investing in top-tier components, you ensure your build is not just fast, but dependable. The combination of a well-sorted 3000GT and the right performance parts creates a driving experience that few modern cars can replicate.