Grimmspeed Radiator Hose Kit Black For Subaru 02-07 Impreza/WRX/STI GrimmSpeedGRM 405325 Your Subarus cooling system is only as good as its weakest link, commonly thats 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 its a daily driver or a high horsepower build, it's important to make sure your radiator hoses are up for the job. They need