Ballade Sports 4 Inch Velocity Stack Turbo GuardBallade Sports 4 Inch Velocity Stack Turbo Guard We made a simple solution to the current turbo screens guards by adding a velocity stack. The velocity Stack is designed to help accelerate the flow of air entering the turbo while the mesh screen provides protection to the turbo from larger debris and other objects. Designed for 4 Turbo Inlets. Velocity Stack made of high heat resistant solid plastic Velocity Stack Dims: 70mm Height 160mm Inlet 4 inch