The GESi® G-Sport Catalytic Converter Inlet/Outlet Transition Cones are designed to create a smooth and even transition between your GESi® high flow cat body and your main exhaust pipe. Available for either a 2.5-inch or 3-inch exhaust, these transitions are guaranteed to make sure your Catalytic Converter has a sleek, air-tight, and even fit in your custom exhaust system.