GrimmSpeed 1.3 Bar Type A Radiator Cap (GRM1.1013.1.BLK)

Maximize your cooling systems potential with the GrimmSpeed high pressure radiator cap. Rated for 1.3 bar (18.9 PSI), this cap not only increases your cooling systems efficiency, but looks great in the process. Designed as a direct replacement for your factory cap for easy installation.

Vehicle Fitment:
• All Subaru radiators and/or expansion tanks
• Many (but not all) Nissan, Mitsubishi, Honda, Mazda, and Toyota models
• Not suited to replace the 1-way "earless" cap on the STI radiators, but will work perfectly on the upper expansion tank!
• Fits Koyo aluminum radiators with fill necks and most aftermarket radiators
• 1992-2015 Evolution I-X<br>
• 1990-1999 DSM (Eclipse, Talon, Laser)
• 1991-1999 3000GT & Stealth
• 2002+ Subaru WRX & STi (2002-2022+)
• 2009+ Nissan R35 GT-R
• 2003+ Nissan 350Z & 370Z
• 1988-1991 Honda Civic
• 1990-1993 Acura Integra
• 1992-2001 Honda Prelude

Quick Specs:
• 1.3 Bar/18.9 PSI pressure rated
• Electro-coated stamped steel construction
• Heavy-duty silicone seal
• Eliminates ugly OEM yellow badge
• Manufactured in Japan

More from GrimmSpeed:
Let's face it - engine cooling technology can sometimes seem like a dark magic that is impossible for us mortals to understand. That being said, it is well known that raising the pressure in your cooling system has a direct correlation to cooling performance. The factory 1.1 Bar (16 PSI) cap performs fine for daily driving with a system full of anti-freeze, but for those who are looking to push their Subaru harder or run on the track may be running an anti-freeze/water blend (or in many cases just straight distilled water) as it provides better heat transfer and dissipation than your standard coolant or antifreeze. The downside to running water or a blend of antifreeze/water is a lower boiling point and thus you would easily fill up (and in some cases overflow) your expansion tank within a couple of hot laps.

Upgrading the radiator cap to one with a higher pressure rating is the easiest (and by far the most economical) solution for solving this issue and keep your cooling fluid of choice where it belongs - in your engine and radiator.