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GDT proudly offers the industry's first Subaru DOHC EJ Cylinder 4 Combustion Chamber Cooling kit that increases coolant flow in the left-hand cylinder head. Improving the coolant's flow improves reliability by reducing detonation causing hot spots. Each kit includes an assembled hose kit that features a high-grade silicone hose and custom machined 6061 anodized fitting. The kit also includes a stainless steel "T" fitting and pinch clamps. The kit is designed to fit all EJ20 / EJ25 2002-14 WRX, 2004-2020 STI, 2004-08 Forester XT, and 2005-09 Legacy GT.
Kit Includes
- (x1) Assembled Hose Kit w/ anodized fitting and stainless pinch clamp.
- (x1) Stainless "T" Fitting
- (x3) 316SS or 304SS embossed worm clamps (subject to market availability)
- (x1) Instructions
Vehicle Fitment
- 2002 - 2014 Subaru WRX
- 2004 - 2021 Subaru STI
- 2004 - 2008 Subaru Forester XT
- 2005 - 2009 Subaru Legacy GT
WARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to https://www.P65Warnings.ca.gov/passenger-vehicle.
| SKU | CYL4COOL |
|---|---|
| Brand | IAG Performance |






