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Retire the Dry Rotted Hoses Before They Leave You Stranded
Coolant hoses on a Forester XT that has been on the road for well over a decade are usually the weakest link in the entire cooling system, and dry rotted rubber can crack without warning. The GRMGRM405323 GrimmSpeed Radiator Hose Kit replaces those aging factory hoses with a 5 ply silicone construction reinforced between every layer for lasting durability. Reverse engineered from brand new factory hoses, the GRMGRM405323 kit installs without trimming or kinking, and it is built to handle the increased heat and pressure of a built motor as well as daily commuting duty.
Key Features
- 5 ply silicone construction with fiber reinforcement between every layer
- 3D scanned for a precise factory style fit on GRMGRM405323 applications
- Includes upper hose, lower hose, and four stainless steel BREEZE high torque clamps
- Embedded GrimmSpeed logo on each hose
- Available in a black finish for a clean factory look
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2004-2008 | Subaru | Forester | XT |
Specifications
| Detail | Value |
|---|---|
| Part Number | GRMGRM405323 |
| UPC | Not published by manufacturer |
| Color | Black |
| 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 GRMGRM405323?The GRMGRM405323 is a GrimmSpeed silicone radiator hose kit built for the 2004-2008 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 GRMGRM405323 require any cutting or trimming during install?No. The GRMGRM405323 hoses are reverse engineered from factory hoses, so they match the stock routing and length without any modification.
What color is the GRMGRM405323 available in?The GRMGRM405323 is offered in a black silicone finish with an embedded GrimmSpeed logo.
Are hose clamps included with the GRMGRM405323?Yes. Every GRMGRM405323 kit ships with four stainless steel high torque clamps from BREEZE.
Why upgrade to the GRMGRM405323 over stock hoses?Factory rubber hoses on a Forester XT this age are often dry rotted and prone to sudden failure. The GRMGRM405323 uses a 5 ply silicone build that resists heat and pressure far better than the aging factory rubber.
Is the GRMGRM405323 a direct fit replacement?Yes. The GRMGRM405323 is designed as a direct bolt in replacement for the factory upper and lower radiator hoses on the Forester XT.
How many hoses come in the GRMGRM405323 kit?The GRMGRM405323 kit includes two hoses, one upper and one lower, along with the mounting clamps.
Can the GRMGRM405323 handle a built motor?Yes. The reinforced silicone construction of the GRMGRM405323 is built to withstand the higher temperatures and pressures seen in modified, higher horsepower builds.
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 GRMGRM405323 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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