Silicon Hose 90 Elbow 4.00" BLACKSilicon Hose 90 Elbow 4. 00" BLACK The Silicon Hose 90 Elbow 4. 00" BLACK is a genuine Turbosmart performance part designed for reliable operation, precise fitment and proven results on street and track builds. Introducing the Silicon 90 Degree Silicon Hose! This high performance, multi layered silicone hose is ideal for turbochargers and engine applications. The hose is constant temp resistance from 50 to 170 degrees Celsius ( 60 to 340 degrees