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. 

Will only work with stock intake manifold.

For RB20DET - the top hose hose just needs to be cut to fit (you don't need 90 degree curve)

Nissan RB25DET - Blue

** All ISR Performance Products are Designed for Off Road Use Only **