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Subaru EJ Cylinder 4 Cooling Mod by GetaDomTune
Industry-first (and patent-pending) DOHC EJ Cylinder 4 Combustion Chamber Cooling kit increases coolant flow in the LH head to improve reliability by reducing detonation causing hot spots, reducing EGT delta, and improving overall cooling system performance. With this installation, you'll be able to lower temps in cyl 4, which is the one most prone to pre detonation.