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HKS GTIII-4R Turbine External WG A/R (.81 or 1.0)

HKS GTIII-4R Turbine External WG A/R (.81 or 1.0)

SKU: hks14001-AK033

【Variable Ported Shroud】

※Ported shroud functions depending on the bolt's position.
※When surge occurs due to the vehicle specification,ported shroud is able to prevent surging.



  • A successor model of TO4Z. Compact in size, but withstandable over 700PS.
  • Highly reliable MHI high performance CHRA & highly durable aluminum forged impeller are well-balanced.
  • Ported shroud function is selectable using an adapter.
    Replacing the position of the bolt securing ported shroud is able to keep the intake air path to reduce surging.
  • Impeller wheel rotation sensor compatible. (The sensor will be available separately.) 
    Easy replacement with TO4Z series turbine and the turbo kit using TO4Z. (Oil inlet / outlet are designed for GTIII-4R).
    * Water cooling line is not available.
  • Note:

    • The graph above shows the result of in-house testing.
      The actual results may vary depending on each vehicle's specification(s).
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