Ensure your Subaru WRX, STI, BRZ, Legacy GT, or Forester XT cooling system maintains proper pressure with high-quality Subaru radiator caps from Cosworth and OEM Subaru. A properly rated radiator cap is essential for maintaining cooling system pressure, raising the coolant boiling point, and preventing overheating or coolant loss in both stock and performance Subaru builds. Whether you're maintaining your factory EJ or FA engine or upgrading your Subaru cooling system for higher boost and track use, IAG Performance offers reliable radiator cap options you can trust. Here are some of the brands we carry: CSF, Gates, Koyo, Mishimoto, and Subaru.