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ISR Performance Silicone Radiator Hose – Nissan RB25DET – Blue 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 **LEGAL IN CALIFORNIA ONLY FOR RACING VEHICLES WHICH MAY NEVER BE USED, OR REGISTERED OR LICENSED FOR USE, UPON A HIGHWAYAbout ISR PerformanceISR Performance Products was developed to fill a much needed voice in the sport compact aftermarket. Through years of extensive research, design and on-track testing, ISR Performance is dedicated to providing high quality products at amazing prices. All ISR products are thoroughly tested on vehicles on and off the track prior to being released to the public. In other words, ISR knows what they are selling. Best of all, we get it right the first time through decades of combined knowledge and experience. As a result, we pass our savings onto our consumers – not many companies that produce an inexpensive product even know what they are selling. At the end of the day, ISR Performance offers products that fill a void in the sport compact industry: we blend quality with affordability. Guaranteed.