Let’s be real—understanding engine cooling can feel like deciphering ancient hieroglyphics. But here’s the deal: cranking up the pressure in your cooling system can really boost its performance. The stock 1.1 Bar (16 PSI) cap does the job for everyday driving, especially with a full tank of antifreeze. But if you’re the kind of driver who likes to push your Subaru to its limits—maybe you’re hitting the track or just want to squeeze out every bit of performance—you might be mixing in some distilled water or a water/antifreeze blend. This combo helps with heat transfer, but it also brings a lower boiling point, which can lead to overflowing your expansion tank after a few hot laps.
So, what’s the fix? Upgrading to a higher pressure radiator cap is a simple and budget-friendly way to keep that precious coolant where it belongs—flowing through your engine and radiator. Enter the GrimmSpeed High Pressure 1.3 Bar Radiator Cap. It’s a solid upgrade that not only enhances your cooling system’s efficiency but also gives your engine bay a cleaner look by ditching that ugly OEM yellow badge.
So if you’re looking to keep your Subaru cool under pressure without spending a fortune, this GrimmSpeed cap is a no-brainer. It’s a small upgrade that can make a big difference.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Grimmspeed is an automotive aftermarket company that was founded in 2006 by Justin Grimm. They specialize in creating parts for the exhaust system for various automotive vehicles. Grimm has always had this passion for cars and had always wanted to improve his vehicle’s performance. After numerous trials, he was able to perfect his craft and later on decided to turn it into his career. Today, they have become one of the leading brands when it comes to producing high-performance exhaust systems.
Expanding their Product OfferingThe company initially manufactured parts for Subaru. But as the company expanded, they started offering parts for other brands such as Ford, Mitsubishi, Hyundai, and Mazda. They now offer parts such as intercoolers, intake, exhaust, engine pulleys, gaskets, boost controllers, phenolic spacers and so much more.
Continuous Product DevelopmentGrimmspeed never stops in finding ways to produce innovative products and is always on the push to keep their products up to date. With the rapid change in automotive technology, it is a must that their product is able to adapt to this change for it to satisfy the demand of its users. This is the reason why the company has gained the trust of many tuners all around.
Purchase Grimmspeed Product at Vivid RacingBuilt by an enthusiast for fellow enthusiasts.
If you want a product that is designed to improve the performance of your vehicle, then Grimmspeed is the brand for you. To know more about Grimmspeed, visit Vivid Racing and check out their list of products that would fit your specific needs.