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

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