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

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