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Silicone Cooling Confidence Built for Boost
The factory rubber radiator hoses on your Subaru break down over time as heat cycles dry out the internal fibers, leading to soft spots, expansion, and eventually a leak at the worst possible moment. The GRMGRM405328 GrimmSpeed Radiator Hose Kit replaces those aging OEM hoses with a 5 ply silicone construction that resists heat, pressure, and age far longer than stock rubber. Every GRMGRM405328 kit is 3D scanned from factory hoses for a true direct fit, so there is no trimming, no kinking, and no guesswork during install. Whether the car sees daily commuting or track days, the GRMGRM405328 kit keeps coolant flowing reliably through the upper and lower hose runs.
Key Features
- 5 ply silicone construction with fiber reinforcement between every layer
- 3D scanned for a precise factory style fit on GRMGRM405328 applications
- Includes upper hose, lower hose, and four stainless steel BREEZE high torque clamps
- Embedded GrimmSpeed logo on each hose
- Available in a vibrant red finish for engine bay styling
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2015-2017 | Subaru | WRX | |
| 2014-2017 | Subaru | Forester | XT |
Specifications
| Detail | Value |
|---|---|
| Part Number | GRMGRM405328 |
| UPC | Not published by manufacturer |
| Color | Red |
| Material | Reinforced Silicone |
| Number of Hoses | 2 (upper and lower) |
| Clamps Included | Yes, 4 stainless steel BREEZE clamps |
| Brand | GrimmSpeed |
What's Included
- 1 upper silicone radiator hose
- 1 lower silicone radiator hose
- 4 stainless steel high torque BREEZE hose clamps
About GrimmSpeed
GrimmSpeed started as a small garage operation in Minneapolis, Minnesota in 2006 and has grown into one of the most trusted names in Subaru performance. What began with a focus on WRX and STI parts has expanded to Mitsubishi, Ford, MazdaSpeed, and Hyundai platforms, but the engineering philosophy has stayed the same: build parts that are tougher, smarter, and better finished than anything else on the market.
FAQ
What is the GRMGRM405328?The GRMGRM405328 is a GrimmSpeed silicone radiator hose kit built for the 2015-2017 Subaru WRX and 2014-2017 Subaru Forester XT. It replaces the factory upper and lower coolant hoses with a 5 ply reinforced silicone design and includes new stainless clamps.
Does the GRMGRM405328 require any cutting or trimming during install?No. The GRMGRM405328 hoses are 3D scanned from factory hoses, so they match the stock routing and length without any modification.
What color options are available for the GRMGRM405328?The GRMGRM405328 is offered in a red silicone finish with an embedded GrimmSpeed logo.
Are hose clamps included with the GRMGRM405328?Yes. Every GRMGRM405328 kit ships with four stainless steel high torque clamps from BREEZE.
Why upgrade to the GRMGRM405328 over stock hoses?Factory rubber hoses degrade with age and heat cycling, which can cause expansion and leaks. The GRMGRM405328 uses a 5 ply silicone build that resists heat and pressure far better than the original rubber.
Is the GRMGRM405328 a direct fit replacement?Yes. The GRMGRM405328 is designed as a direct bolt in replacement for the factory upper and lower radiator hoses on supported models.
How many hoses come in the GRMGRM405328 kit?The GRMGRM405328 kit includes two hoses, one upper and one lower, along with the mounting clamps.
Can the GRMGRM405328 handle track use?Yes. The reinforced silicone construction of the GRMGRM405328 is built to withstand the higher temperatures and pressures seen in spirited driving and track sessions.
Install Instructions
- Allow the engine to cool completely and relieve pressure from the cooling system before starting.
- Drain the coolant into an approved container.
- Loosen and remove the factory clamps and hoses from the radiator and engine connections.
- Install the new GRMGRM405328 upper and lower hoses in the same routing as the factory hoses.
- Secure each connection with the included BREEZE stainless clamps.
- Refill the cooling system with the manufacturer specified coolant.
- Start the engine and check for leaks, then top off coolant as needed once the system has cycled.
Prop 65 Warning
Operating, servicing, and maintaining a passenger vehicle or off road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service the vehicle in a well ventilated area, and wear gloves or wash hands frequently when servicing the vehicle. For more information visit www.P65Warnings.ca.gov/passenger-vehicle
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