Please note: The radiator cap provided with this particular radiator should replace the stock cap that is located n the expansion tank. Your factory issued/stock radiator cap should be the one used on the Mishimoto Radiator. The Mishimoto radiator cap is a two-way valve, and when compared to the stock single valve, there is a difference in construction, and cannot be used on the radiator. If you try to use the provided Mishimoto cap on the radiator, then you risk overheating.
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