hose reducer 2.50" -2.75" blue silicone hoses are stronger, tougher and more flexible than ordinary rubber hoses. turbosmart silicone hoses are manufactured from a high-grade silicone and offer superior temperature resistance which makes them ideal for cooling/heating and charged-air applications. they will last longer, perform better and will not deform under extreme conditions. an inexpensive and practical performance modification for all types of vehicles.