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

Part #: BXCC - 50000. The BLOX Racing Coolant Flow Upgrade Kit is custom - designed for the #4 cylinder of the left - hand cylinder head in Subaru EJ20 and EJ25 engines. Subaru fans and tuners have long known about the cooling issue in the #4 cylinder of the left - hand cylinder head, which runs hot due to poor coolant flow. This kit boosts coolant flow to cylinder 4 by drawing in flow from the water pump, reducing the risk of overheating and detonation. Applications include 2004 - 2021 STi, 2002 - 2014 WRX, 2005 - 2008 Forester XT, 2005 - 2009 Legacy GT, and 2005 - 2009 Outback XT.

Using this BLOX Racing Coolant Flow Upgrade Kit is quite straightforward. First, make sure your vehicle's engine is cool. Locate the left - hand cylinder head's #4 cylinder in your Subaru EJ20 or EJ25 engine. Then, carefully install the kit according to the included instructions, connecting it to draw coolant flow from the water pump. As for maintenance, regularly check the coolant level in your vehicle. If you notice a significant drop in coolant, it could mean there's a leak. Also, inspect the kit for any signs of wear or damage. If you see cracks or loose connections, replace the relevant parts. Keep in mind that this kit is specifically for the #4 cylinder of the left - hand cylinder head in the mentioned Subaru models, so don't try to use it on other cylinders or non - compatible engines.