HKS High Pressure Radiator Cap Limited Race Edition for most of Mazda, Mitsubishi, Nissan, Subaru’s vehicles. In a cooling system, a higher pressure equates to a higher boiling point for the coolant. Higher coolant pressures also transfer heat from the cylinder heads more efficiently. A radiator cap with the high pressure rating that the radiator is designed to accept.
- Specification is 1.1 kilograms per square centimeter
- Made in Japan
- Exclusive line of branded accessories and apparel lets you make the style statement









Ryan –
I got exactly what I ordered and it looks great. Really compliments the engine bay, great quality as well. Excellent product!
billy –
The product works great and does what it was meant to do. Makes a great replacement or a great touch to the engine bay. dosnt leak like many other aftermarket caps. I will continue using hks products.
chris g –
Awesome
SC/DC –
This is exactly what I needed for my true-to the 90s spec build. The colors are super classy, but subtle.The seal is silicone, so I expect it to outlast the auto parts store caps by a long shot.
Chase –
First thing, I’m very happy that Amazon has genuine Japanese automotive items and products we can all purchase. Second, I have a 2003 Honda Civic (EM2). I should have researched more on this item specifically because the OEM radiator is not designed for the high pressure spring cap. So, i’ll have to return the item unfortunately. Learn from me, research first. Everything aside, very nice piece and recommend to every automotive enthusiast.
Alexander Allen –
Great addition to my 2007 Mazdaspeed 6 engine bay, no negative problems.
rimtuckclub –
Great product perfect fitment with some nice bling under the hood
digital dinosaur –
Works on mishimoto radiator for s14- the mishimoto rad cap is pure trash and was causing boil over and overheating. Swapped to this cap and problems are gone. Could have just went with a cheaper replacement but wanted the hks drip