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 plastic "T" fitting and stainless steel pinch clamps. The kit is designed to fit all EJ20 / EJ25 2002-14 WRX, 2004-2018 STI, 2004-08 Forester XT, and 2005-09 Legacy GT.