Cylinder 4 Cooling Modification C4CM



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SKU: FRCO114-FRCO115 Category:

Extra Cool

The Fuji Racing Coolant modification for the Subaru EJ Series Engines was designed to reduce the coolant passage ‘dead spot’ which is located over cylinder 4. Basically, this kit allows the coolant to travel through the cylinder 4 passage and recirculate around the cooling system. What this does is balance out the cylinder temperatures which in turn allows for a more equal fuel and timing map on the car So now that all 4 cylinders are running similar temperatures this will help reduce cylinder knock & detonation. This kit is Dyno Tested and proven to work !!

Additional information

Weight 0.4 kg
Dimensions 12 × 11 × 2 cm

Forester SF 96-02, Forester SG 02-08, Forester SH 08-12, Impreza GC/GF/GM 92-00, Impreza GD/GG 00-07, Impreza GR/GV/GH 07 – 14, Legacy BC/BF/BJ 90-94, Legacy BL/BP 03-09, WRX STi VAB/VAF 14-21


Fuji Black, Fuji Gold

Model Application:

Suitable for the following models:

  • Subaru EJ turbo engines

If you are unsure of fitment or application then please contact us with your vehicles chassis number.

What's in the kit:



  • 1 x Pre Cut Hose
  • 1 x Custom Made Hose
  • 1 x T-Piece
  • 1 x Billet cylinder head reducer
  • 1 x 45 Billet hose fitting
  • 4 x Spring Clips
  • PDF Fitting Instructions