Kinugawa Ball Bearing Turbocharger TD05H-18G 2.25" — Performance Upgrade for Subaru WRX / STI 1998–2008 (EJ20 / EJ25)
The Kinugawa TD05H-18G is a complete STS Advanced dual ceramic ball bearing turbocharger offering a step-up in compressor trim over the OEM TD04L / IHI RHF55 units. Designed as a direct-fit replacement for 1998–2008 Subaru WRX and STI (EJ20 / EJ25), it delivers stronger mid-range torque and improved top-end power while retaining the stock single-scroll turbine housing inlet. Balanced on a Schenk MBRS 110 and backed by Kinugawa’s 1-Year Trouble-Free Warranty.
What Vehicles Does the TD05H-18G 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: 50.3 / 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
- Material: High-Ni alloy for thermal resistance
Bearing Type — STS Advanced Dual Ceramic Ball Bearing
Improves boost response by 10–15% over journal bearing designs with superior shaft dynamics control for longer service life.
Cooling & Actuator
- Cooling: Oil and water cooling
- Default actuator: 1.0 bar / 14.7 psi — custom settings (0.3 / 0.5 / 0.8 / 1.2 / 1.5 / 1.7 / 2.0 bar)
What’s Included
- 1 × Turbocharger (TD05H-18G) | 1 × Oil supply kit | 1 × Water supply & return pipe kit
- 1 × Return oil pipe kit | 1 × Turbine inlet & outlet gasket | 5 × Studs and nuts
- 1 × Balance Report with Anti-Counterfeit Tag — Schenk MBRS 110 certified (Germany)
Quality & Warranty
- Brand New | Origin: Taiwan | Full dynamic balance on Schenk MBRS 110 (Germany)
Kinugawa offers a 1-Year Trouble-Free Warranty — free overhaul, recondition, or replacement if your turbo fails for any reason.
Note: Maximum power figures represent potential flywheel power based on compressor map choke flow. Actual results depend on vehicle modifications and tuning/calibration.
Provider: Kinugawa Turbo Systems