Racing Suction WRX STI Explanation of the product Application chart
Racing Suction

Code No. 70020-AF108




Racing suctions combines SUPER POWER FLOW (an open type filter) with aluminum pipe to improve air intake efficiency





  • Kit includes Super Power Flow and Aluminum Suction pipe. Polished aluminum pipe improves engine room appearance.
  • Enjoy a distinctive induction sound.
  • Improving an air intake efficiency, HKS changed from flexible stock rubber hose to aluminum pipe. This significantly reduces an airflow restriction at an HKS flow bench test compared to the stock intake system.
  • Removable air duct (air guide) which has a wide opening is newly designed. This can be directly used stock ECU even for the normal vehicle or the vehicle with a custom muffler. You can reduce more air intake resistance, removing the air guide. (*)
    (*) ECU setting is required when combination use of the metal catalyzer or removing the airflow adapter guide.





【with/without air duct】

The air duct is a removable part. Reduced more air intake resistance, removing the air duct which enlarge the inner diameter.

* ECU setting is required when removing the air duct.



【ECU when used with HKS parts】
Mufflers Stock ECU
Metal catalyzer PHASE2 of Flash Editor is not compatible with Metal Catalyzer. Please customize the data for your car accordingly.
Dry carbon suction Stock ECU
GT III Sport turbine kit ECU setting at the actual vehicle is required.

Note: ECU setting at the actual vehicles is required when removing the air duct in every vehicle specifications.



【Performance comparison data】 *In-house data

WRX STI Flow Bench Data



Vehicle Classification Model Engine Model Year Style Size Code No. Price Remarks
WRX STI CBA- VAB EJ20(TURBO) 14/08- Racing Suction Φ200-80/Red 70020-AF108