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GNP's Cylinder 4 Coolant Mod was designed for Subaru EJ Engines to help increase coolant flow to cylinder 4 head area. The additional coolant flow helps reduce cylinder #4 coolant temps and keeps the temps more uniform with the rest of the cylinders.


Doing this helps reduce knock and detonation in cylinder #4

GNP's kit includes CNC'd billet aluminum head, stainless steel T fitting along with a multi-layer reinforced Vibrant silicone hose and stainless steel clamps.



- CNC'd 6061 Billet Aluminum Fitting

- Multi-Layer Silicone Hose

- Stainless Steel Clamps

- Limited Lifetime Warranty



2004-2020 Subaru STI & Type-RA

2002-2014 Subaru WRX

2005-2009 Subaru Legacy GT

2004-2009 Subaru Forester XT

2005-2009 Subaru Legacy GT

2005-2009 Subaru Outback XT

All EJ20 / EJ25 engines

GNP's Cylinder 4 cooling mod

C$109.20 Regular Price
C$99.95Sale Price
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