Kinugawa Turbo Ball Bearing 2.4" TD05H G25-660 for Subaru Impreza WRX STI 2004-2020
Kinugawa TD05H G25-660 Ball Bearing Turbo — Subaru WRX & STI Bolt-On Upgrade
The Kinugawa TD05H G25-660 is a direct bolt-on turbocharger upgrade for 2002–2014 Subaru WRX, 2004–2020 WRX STI, and 2004–2007 Forester XT. It replaces OEM turbos including TD04L, IHI VF30, and VF35 without modification, and is capable of supporting 500+ horsepower with a built engine and supporting modifications.
G Series Compressor — CFD-Engineered for Maximum Flow
The billet G Series compressor wheel features 9+0 equal-length blades machined via Third-Order Free Surface (Point Milling) — a 120-minute precision process that delivers up to 30% more airflow than GTX GenII at 79–80% efficiency. Max flow rate: 60 lb/min at PR:2 / EF:60%.
Free Surface vs. Ruled Surface Machining
Free Surface (Point Milling) — used in this turbo:
- 120-minute precision machining per wheel
- Superior airflow efficiency and pressure characteristics
- Optimized blade geometry for high-performance turbochargers
Ruled Surface (Flank Milling) — standard industry method:
- 15-minute machining cycle
- Lower aerodynamic efficiency
- Suited to basic centrifugal compressor applications
Vehicle Fitment
- 2002–2014 Subaru WRX (EJ20T / EJ205)
- 2004–2020 Subaru WRX STI (EJ257)
- 2004–2007 Subaru Forester XT
- Direct replacement for TD04L, IHI VF30, VF35 — no modification required
Turbocharger Specifications
CHRA: TD05H G25-660
Compressor wheel: 54/67mm — 9+0 blades, Third-Order Free Surface (Point Milling)
Turbine wheel: 56/49mm — STS (Superior Turbine Strike) technology
Compressor housing: AR.60 nozzle, 2.4" inlet, 2" outlet
Turbine housing options: 7cm/AR.49 or 8cm/AR.57
Turbine inlet: Subaru single scroll
Turbine outlet: Subaru 5-bolt
Wastegate: Internal gated (IWG)
Turbine material: High-Ni alloy for thermal resistance
Bearing type: STS Advanced Dual Ceramic Ball Bearing
Cooling: Oil and water cooling
Actuator pressure (default): 1.0 bar / 14.7 psi
Custom actuator pressures available: 0.3, 0.5, 0.8, 1.2, 1.5, 1.7, or 2.0 bar
STS Advanced Dual Ceramic Ball Bearing
This turbo uses Kinugawa's proprietary STS Advanced (Superior Turbine Strike) dual ceramic ball bearing system — engineered for faster spool, reduced friction, and extended service life compared to journal bearing designs.
What's in the Box
- 1× TD05H G25-660 Turbocharger
- 1× Oil supply set
- 1× Water supply and return pipe set
- 1× Return oil pipeline
- 1× Turbine inlet and outlet gasket
- 5× Stud and nut set
- 1× Balance Report with Anti-Counterfeit Tag
Condition & Quality
- Brand new
- Full balance certified by SCHENK MBRS 110 (Germany)
Manufacturer
Kinugawa Turbo Systems
Warranty
Kinugawa Turbo Systems offers a KINUGAWA TROUBLE-FREE WARRANTY for 1 year from the purchase date to the original purchaser. If your turbocharger fails or has an issue, return it for a free overhaul, recondition, or replacement depending on availability. Kinugawa covers you no matter the issue.
Note: Maximum power stated represents potential flywheel power based on compressor choke flow. Performance results depend on your vehicle's modifications and tuning/calibration.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Kinugawa TD05H G25-660 Ball Bearing Turbo — Subaru WRX & STI Bolt-On Upgrade
The Kinugawa TD05H G25-660 is a direct bolt-on turbocharger upgrade for 2002–2014 Subaru WRX, 2004–2020 WRX STI, and 2004–2007 Forester XT. It replaces OEM turbos including TD04L, IHI VF30, and VF35 without modification, and is capable of supporting 500+ horsepower with a built engine and supporting modifications.
G Series Compressor — CFD-Engineered for Maximum Flow
The billet G Series compressor wheel features 9+0 equal-length blades machined via Third-Order Free Surface (Point Milling) — a 120-minute precision process that delivers up to 30% more airflow than GTX GenII at 79–80% efficiency. Max flow rate: 60 lb/min at PR:2 / EF:60%.
Free Surface vs. Ruled Surface Machining
Free Surface (Point Milling) — used in this turbo:
- 120-minute precision machining per wheel
- Superior airflow efficiency and pressure characteristics
- Optimized blade geometry for high-performance turbochargers
Ruled Surface (Flank Milling) — standard industry method:
- 15-minute machining cycle
- Lower aerodynamic efficiency
- Suited to basic centrifugal compressor applications
Vehicle Fitment
- 2002–2014 Subaru WRX (EJ20T / EJ205)
- 2004–2020 Subaru WRX STI (EJ257)
- 2004–2007 Subaru Forester XT
- Direct replacement for TD04L, IHI VF30, VF35 — no modification required
Turbocharger Specifications
CHRA: TD05H G25-660
Compressor wheel: 54/67mm — 9+0 blades, Third-Order Free Surface (Point Milling)
Turbine wheel: 56/49mm — STS (Superior Turbine Strike) technology
Compressor housing: AR.60 nozzle, 2.4" inlet, 2" outlet
Turbine housing options: 7cm/AR.49 or 8cm/AR.57
Turbine inlet: Subaru single scroll
Turbine outlet: Subaru 5-bolt
Wastegate: Internal gated (IWG)
Turbine material: High-Ni alloy for thermal resistance
Bearing type: STS Advanced Dual Ceramic Ball Bearing
Cooling: Oil and water cooling
Actuator pressure (default): 1.0 bar / 14.7 psi
Custom actuator pressures available: 0.3, 0.5, 0.8, 1.2, 1.5, 1.7, or 2.0 bar
STS Advanced Dual Ceramic Ball Bearing
This turbo uses Kinugawa's proprietary STS Advanced (Superior Turbine Strike) dual ceramic ball bearing system — engineered for faster spool, reduced friction, and extended service life compared to journal bearing designs.
What's in the Box
- 1× TD05H G25-660 Turbocharger
- 1× Oil supply set
- 1× Water supply and return pipe set
- 1× Return oil pipeline
- 1× Turbine inlet and outlet gasket
- 5× Stud and nut set
- 1× Balance Report with Anti-Counterfeit Tag
Condition & Quality
- Brand new
- Full balance certified by SCHENK MBRS 110 (Germany)
Manufacturer
Kinugawa Turbo Systems
Warranty
Kinugawa Turbo Systems offers a KINUGAWA TROUBLE-FREE WARRANTY for 1 year from the purchase date to the original purchaser. If your turbocharger fails or has an issue, return it for a free overhaul, recondition, or replacement depending on availability. Kinugawa covers you no matter the issue.
Note: Maximum power stated represents potential flywheel power based on compressor choke flow. Performance results depend on your vehicle's modifications and tuning/calibration.
