Integrated Engineering Silicone Adapter for 4" Turbo InletsThis silicone adapter kit will allow you to fit your IE Carbon Fiber Intake for 2. 5T 8V RS3 & 8S TTRS engines to a 4" sized turbo inlet. This kit will serve as a direct fit for most non IE brand 4" turbo inlets. This adapter kit will fit most 4" inlets without any modification, a direct fit is not guaranteed for every brand and some minor trimming may be necessary. Note: This is NOT required if you are fitting your IE intake to a stock or IE brand