GT II SPORTS TURBINE KIT IMPREZA Explanation of the product Application chart

Code No. 11004-AF010





  • Factory Replacement Type Sports Turbine Kit for SUBARU EJ25 Single Scroll Turbine.
  • 360HP was the number we figured out as the practical maximum engine output of the stock EJ25 engine from various verification. To reach the optimized performance within this range, the turbine kit was developed. For further performance improvement, this turbine kit can be used with the upgraded pistons and connecting rods; so the engine output can be reached to 430hp.
  • The ball bearing turbine of this kit was originally designed by HKS. Enlarged turbine wheel increases air volume. The ball bearing can reduce response loss. Also, the bypass port was also enlarged to reduce load to the engine restricting the exhaust pressure increase at high engine rpm.
  • This turbine kit includes all necessary parts in order to install the kit such as an actuator, oil outlet pipe, etc. (There may be parts necessary to buy separately depending on type of the boost pressure controller.)
  • This kit can be used with any HKS product.




(* This result is the actual values of in-house test using the chassis dynamometer. The result may vary depending on the measuring equipment. ※ Test Vehicle: JDM vehicle w/ the automatic transmission. )




  • HKS GTII 7460 STK
  • HKS R-type Intercooler
    (Front mount type)
  • HKS F-CON iS
  • HKS EVC5
  • HKS Racing Suction Reloaded
  • HKS 650cc Injector
  • HKS EsPremium Muffler
  • HKS Exhaust Manifold
  • HKS SUS Turbine Support Pipe
  • HKS Metal Catalyzer
  • HKS Super Fire Racing Plug M40iL


  • GTII 7460 Turbine
  • Upgrade Actuator
  • Oil Piping
  • water Piping
  • Gasket/ Short Parts



  • Time required for installation&modification: 6-8 hours
  • Since the turbine scroll is bigger, it comes in contact with the transmission case.
    Shave the part of transmission.
  • Modification of factory heat insulator and bracket is required to install this kit.
  • This kit may be able to be installed on a vehicle with automatic transmission. However, the performance cannot be guaranteed without accurate settings.
  • This kit may be able to be installed on GC8, GDB Type A & B. However, we did not test this kit on these models.



MODEL Control
Compressor Wheel Compressor Housing
Trim Inlet Dia.
Outlet Dia.
Inlet Dia.
Outlet Dia.
GT II 7460 Actuator 430 49 52.0 74.00 EJ only EJ only 0.82
Turbine Wheel Exhaust Housing
Trim O. D.
Outlet Dia.
Inlet Flange Outlet Flange A/R
81 60.0 54.0 EJ single scroll only EJ only 0.85


Vehicle Model Engine Model Year Type Turbine Size Boost Pressure Code No. Price Remarks
IMPREZA GVF EJ25(TURBO) 10/07-14/08 GT II SPORTS TURBINE KIT GTII 7460 49T A/R0.85 88.3kPa (0.9kgf/cm2) 11004-AF010 * To be discontinued. Single scroll, For MT only.