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Cylinder 4 Coolant Flow Upgrade Kit - Subaru EJ-Series - BLOWOUT


WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov

BLOX Racing Coolant Flow Upgrade Kit is specifically intended for the Subaru EJ20 and EJ25 left hand cylinder head’s #4 cylinder.

Longtime Subaru enthusiasts and tuners know the inherent cooling design oversight in Subaru’s left hand cylinder head, in the #4 cylinder, that always sees the hottest temps due to a lack of flow.

This kit helps to increase coolant flow to cylinder 4 and minimizes the overall risk of overheating and detonation, by drawing in flow from the water pump. 

Vehicle Applications

  • 2004-2020 STi
  • 2002-2014 WRX
  • 2005-2008 Forester XT
  • 2004-2009 Legacy GT