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Small Carbon Fiber Radiator Cap by Mishimoto. Getting the most out of your performance parts comes down to the details. When faced with hard driving conditions, a vehicle�s cooling system becomes highly pressurized. OEM caps are not equipped to handle higher pressure, causing fluid to leak out into the overflow reservoir. The Mishimoto radiator cap is rated at a higher pressure and will keep coolant where it needs to be-flowing within the system.