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GrimmSpeed Radiator Hose Kit Black 2008-2014 WRX / 2008-2021 STI / 2009-2013 Forester XT

SKU 405322
Original price $110.00 - Original price $110.00
Original price
$110.00 - $110.00
Current price $110.00
35 In Stock, Usually Ships within 1-2 Business Days

Your Subaru’s cooling system is only as good as its weakest link, commonly that’s the old, dry-rotted OEM coolant hoses. As your Subaru ages and the integrity of those hoses degrades, cracks develop and you can suddenly find yourself stranded on the side of the highway or the racetrack.

To keep a car reliable, whether it’s a daily driver or a high-horsepower build, it's important to make sure your radiator hoses are up for the job. They need to be able to handle not only everyday conditions, but also the increased temperatures and pressures of a built motor without bulging, leaking, or altogether blowing up. That’s where GrimmSpeed comes in. GrimmSpeed has always been synonymous with top-notch parts manufacturing and superior quality, developing parts that can handle whatever you throw at them. Things are no different when it comes to the brand new GrimmSpeed Silicone Radiator Hoses.

These hoses are manufactured using a 5-ply construction system with fiber reinforcement between each layer of silicone to ensure that they maintain their shape and durability for the life of the vehicle. GrimmSpeed Silicone Radiator Hose Kits were designed by reverse engineering brand new factory hoses for a perfect fit and effortless installation without having to trim or kink the pieces. The kits are offered in a black or red color with the trademark GrimmSpeed logo embedded into each one and are available for a variety of Subaru applications. Every kit includes an upper hose, a lower hose and four stainless steel high-torque clamps from BREEZE.

We take pride in our products and the name that stands behind them, so as with all of the parts we manufacture, these units come with a Lifetime Warranty and will be the last set of radiator hoses you’ll have to buy.


  • 5-ply silicone construction
  • 3D scanned for perfect fit
  • High quality replacement clamps included
  • Lifetime Warranty


  • 2008-14 Subaru WRX
  • 2008-21 Subaru STI
  • 2009-13 Subaru Forester XT
  • 2009-10 Subaru Forester
  • 2008-11 Subaru Impreza
  • 2005-09 Subaru Legacy GT
  • 2005-09 Subaru Outback XT

Customer Reviews

Based on 4 reviews

Good quality hoses and very strong

Reliability FTW!

I bought these Grimmspeed hoses as they’re one of the few available that are 4-ply silicone. Much more reliable than the oem rubber pieces. I picked these up to complement the installation of key reliability mods for my ‘19 STi. Anyone with an EJ motor should opt for, at minimum, an AOS, Grimmspeed hoses, KoyoRadiator, Killer B water pump housing and a Cylinder-4 cooling mod to make these engines last as long as possible.


You have made an excellent choice by opting for the GrimmSpeed Radiator Hose Kit for your '19 STI! Upgrading to 4-ply silicone hoses is a smart move, as they offer improved reliability and durability compared to the OEM rubber hoses. When combined with other key reliability mods like an AOS, Koyo Radiator, Killer B water pump housing, and a Cylinder-4 cooling mod, you are taking important steps to enhance the longevity and performance of your EJ motor. Proper cooling and improved components can help prevent potential issues and extend the life of your engine, ensuring that it runs smoothly and efficiently for years to come. Keep up the great work in maintaining and upgrading your STI! We appreciate your 5 Star Review and added pic! Reliability FTW indeed!


Grimmspeed is always high quality

Was looking for a good upgrade for when doing maintenance and you can't do better. Huge improvement over stock and never hurts to have more GS in the engine bay


The 5 ply GrimmSpeed Radiator Hose Kit ensures reliability over the OEM rubber hoses that lose their rigidity over time resulting in unwanted leaks! They also come with the clamps you need for install! Thank you for the 5 Stars!


moses dasilva
nice product

nice touch to add with the koyo radiator.


The GrimmSpeed Radiator Hose Kit goes great with any radiator! The silicone construction ensures durability and longevity keeping your engine cool under the most strenuous conditions! We appreciate the 5 Stars!


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