Proflow Cast Turbo Aluminium 90 Degree Elbow 4.00in. - PFECE400Part Number: PFECE400 Proflows cast aluminium elbows, elbow reducers and straights keep the flow tight and smooth! The incredibly tight radius of these elbows offers a smooth flow path, making them perfect for many of your turbo and intercooler applications where limited space is an issue. Each elbow comes with a beaded inlet and outlet to allow for a more secure clamping force when using with silicone hose.