Kinugawa Ball Bearing Turbocharger TD05H-16G 2.25" — Direct-Fit Upgrade for Subaru WRX / STI 1998–2008 (EJ20 / EJ25)

The Kinugawa TD05H-16G is a complete STS Advanced dual ceramic ball bearing turbocharger engineered as a direct-fit replacement for 1998–2008 Subaru WRX and STI platforms running EJ20 or EJ25 engines. It replaces the OEM TD04L WRX turbo and IHI RHF55 / RHF5HB (VF30, VF35 and similar) without modification, delivering faster spool, improved mid-range torque, and a broader power band. Balanced on a Schenk MBRS 110 and backed by Kinugawa’s 1-Year Trouble-Free Warranty.

What Vehicles Does the TD05H-16G Fit?

• 1998–2008 Subaru Impreza WRX — EJ20 / EJ25 (TD04L turbo replacement)
• 1998–2008 Subaru Impreza WRX STI — EJ20 / EJ25 (IHI RHF55 / RHF5HB replacement)
• Direct replacement for IHI VF30, VF35, and similar IHI turbos — no modification required

Compressor & Turbine Wheel Specifications

• Compressor Wheel: 48.3 / 68.0 mm — two billet options:
  • Billet 6+6 blades — enhanced low-end torque and strong mid-range response
  • Billet 11+0 blades — optimized for top-end speed and high-RPM airflow
• Turbine Wheel: 56.0 / 49.1 mm — two STS options:
  • 9 Blades STS — lighter, high-flow design for faster spool and broader power band
  • 10 Blades STS 55 — higher blade count for enhanced flow at elevated boost levels

Learn more about STS technology →

Compressor Housing

• Inlet: 2.25"
• Outlet: 2"
• Nozzle area: AR.57

Turbine Housing Options

• 7cm / AR.49 — fastest spool, ideal for street and low-to-mid RPM builds
• 8cm / AR.57 — balanced street/track option for broader power delivery

• Inlet & Outlet: Subaru single scroll
• Wastegate: Internal gated

Bearing Type — STS Advanced Dual Ceramic Ball Bearing

The Kinugawa STS Advanced dual ceramic ball bearing system improves boost response by 10–15% over journal bearing designs, with superior shaft dynamics control for longer service life and reduced oil dependency.

Cooling Type

• Oil and water cooling

Actuator Pressure

• Default: 1.0 bar / 14.7 psi
• Custom settings available: 0.3 / 0.5 / 0.8 / 1.2 / 1.5 / 1.7 / 2.0 bar 

What’s Included in the Kit

• 1 × Turbocharger (TD05H-16G)
• 1 × Oil supply kit
• 1 × Water supply and return pipe kit
• 1 × Return oil pipe kit
• 1 × Turbine inlet and outlet gasket
• 5 × Studs and nuts
• 1 × Balance Report with Anti-Counterfeit Tag — full dynamic balance certified on Schenk MBRS 110 (Germany)

Quality, Condition & Warranty

• Condition: Brand New
• Balancing: Full dynamic balance on Schenk MBRS 110 (Germany)
• Origin: Taiwan

Kinugawa Turbo Systems offers a 1-Year Trouble-Free Warranty from the purchase date to the original purchaser. If your turbocharger fails or has an issue for any reason, return it for a free overhaul, recondition, or replacement depending on availability.

Note: Maximum power figures are calculated based on the compressor map choke flow (total turbo capability) and represent potential flywheel power. Actual performance results depend on your vehicle’s modifications and tuning/calibration.

Provider: Kinugawa Turbo Systems