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Protect Your Cooling System From Dry Rotted Factory Hoses
The GrimmSpeed Radiator Hose Kit replaces the aging factory coolant hoses on the 2015 to 2017 Subaru WRX and 2014 to 2017 Subaru Forester XT with a 5 ply silicone construction built to handle both daily driving and high horsepower builds. As factory hoses age, the internal fibers break down, causing hoses to expand and eventually crack or blow out under pressure, often at the worst possible time. GRM405324 was 3D scanned from factory hoses to guarantee a perfect fit with no trimming or kinking during installation. Each kit includes a fiber reinforced upper hose and lower hose finished in black with the GrimmSpeed logo embedded into the silicone, along with four stainless steel high torque clamps from BREEZE for a complete, worry free cooling system refresh.
Key Features
- 5 ply silicone construction with fiber reinforcement between each layer
- 3D scanned for a perfect factory style fit with no trimming required
- Embedded GrimmSpeed logo on each hose
- Includes four stainless steel high torque clamps from BREEZE
- Improves resistance to heat and pressure versus factory rubber hoses
- Available in black finish
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2015-2017 | Subaru | WRX | |
| 2014-2017 | Subaru | Forester | XT |
Specifications
| Detail | Value |
|---|---|
| Brand | GrimmSpeed |
| MPN | GRM405324 |
| Color | Black |
| Material | 5-Ply Reinforced Silicone |
| Number of Hoses | 2 |
| Clamps Included | 4 Stainless Steel BREEZE Clamps |
| UPC | Not published by manufacturer |
What's Included
- 1 upper radiator hose
- 1 lower radiator hose
- 4 stainless steel high torque BREEZE clamps
About GrimmSpeed
GrimmSpeed is a Seattle based performance manufacturer that designs and builds parts specifically for the Subaru and import performance community. Every part is engineered, tested, and produced with a focus on real world durability, easy installation, and measurable performance gains, making GrimmSpeed a trusted name among WRX and Forester owners nationwide.
FAQ
What is the GRM405324?The GRM405324 is a GrimmSpeed silicone radiator hose kit built for the 2015 to 2017 Subaru WRX and 2014 to 2017 Subaru Forester XT.
What material is GRM405324 made from?GRM405324 uses a 5 ply silicone construction with fiber reinforcement between each layer for durability.
Does GRM405324 require trimming to install?No, GRM405324 was 3D scanned from factory hoses so it installs without trimming or kinking.
Does GRM405324 include hose clamps?Yes, GRM405324 includes four stainless steel high torque clamps from BREEZE.
Why replace factory hoses with GRM405324?Factory hoses degrade over time and can crack or expand under heat and pressure, and GRM405324 offers improved durability for both daily driving and higher horsepower builds.
Is GRM405324 only available in black?GRM405324 is offered in black. A red version of the kit is available under a separate part number.
How many hoses come in the GRM405324 kit?GRM405324 includes one upper hose and one lower hose.
Does GRM405324 fit the FA20DIT engine only?GRM405324 is designed for the FA20DIT equipped 2015 to 2017 WRX and 2014 to 2017 Forester XT.
Install Instructions
- Allow the engine to cool completely before beginning work.
- Drain the coolant system into an approved container.
- Loosen and remove the factory hose clamps at the radiator and engine connections.
- Remove the factory upper and lower radiator hoses.
- Install the new GRM405324 upper and lower hoses in the same routing as the factory hoses.
- Secure each connection with the included stainless steel BREEZE clamps.
- Refill the cooling system with the appropriate coolant and bleed any air from the system.
- Start the engine and check for leaks before returning the vehicle to normal use.
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