ISR Has now released a line of Silicone-based coolant hoses that are designed to take a higher range of heat and coolant pressures than OEM style hoses. Silicone has a much higher strength than the OEM rubber hoses which will prevent the hoses from expanding.
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Legal only for use in competition vehicles which may never be registered, licensed, and/or used on public streets or highways; and also for use in other exempted vehicles.