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This mod was more than just bling. The STI Radiator Cap increases the terminal pressure inside (From 1.0 bar to 1.3 bar) your cooling system. This increases the maximum operating temperature capability of your vehicle's cooling system. This will help prevent coolant loss due to boil-over under extreme operating conditions, which became a problem with the smaller Process West FMIC overflow bottle. 

DO NOT CHANGE YOUR CAP IF YOUR VEHICLE HAS BEEN IN USE WITHIN THE LAST 30 MINUTES.

Have a rag handy, apart from that no tools required.  

There other brand radiator caps out there such as Blitz, Apexi, etc but we are sticking with the family STi radiator cap.

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Removing ye old OEM raditaor cap my require some persuasion. Be sure to have a have backup near by.

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Here is a comparison of the STi (left) and the OEM (right). See the difference? Well if you do could you please let me know as I could not.

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