Blox Cylinder 4 Coolant Flow Upgrade Kit Subaru WRX 2002-2014 / STI 2004-2021

Part #: BXCC-50000 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. APPLICATIONS 2004-2021 STi 2002-2014 WRX 2005-2008 Forester XT 2005-2009 Legacy GT 05-09 outback xt