ISR Performance Silicone Radiator Hose Kit Nissan 350z 2003-2006 Replace your old and worn factory rubber radiator hoses with ISR Performance silicone radiator hoses. Upgrade your cooling system to the strength of a two layer silicone hose. These hoses are designed to take a higher range of heat and coolant pressures than OEM style hoses Not only will these hoses enhance your cooling by resisting heat they also add a nice clean touch to your engine bay.