The CTS Turbo 8V RS3/8S TTRS 2.5T EVO Turbo Outlet Pipe (TOP) is designed to replace the stock cast 'pancake' pipe that comes as factory equipment on your vehicle. Our Turbo Outlet Pipe features 2.50" diameter CNC bent aluminum tube for optimized flow. If you're looking for a simple bolt on modification that will optimize flow, then this part is for you.