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

2004-2013 Subaru Forester XT

2005-2009 Subaru Legacy GT

2006-2009 Subaru Spec B

All EJ20 / EJ25 engines

GNP's Cylinder 4 cooling mod

C$103.99 Regular Price
C$98.99Sale Price
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    Great North Performance © 2019

    Great North Performance parts will change the performance and handling of your car.

    Please drive accordingly, to addjust to the new driving dynamics.

    GNP's performance parts may not be road leagal in all provinces and states, please check with your local laws prior to installation.

    Installation of performance products may void vehicle warranty coverage, if any, on your vehicle.

    GNP is not responsible for any losses incurred from the use of any and all products sold.

    The owner of the car and user of the products are solely responsible for the legality and safety

    of their own vehicle when you modify using aftermarket components.