The AMS MK7 Golf R Downpipe features an extremely wide mouth that matches the exact shape and size of the turbine outlet. This increases the efficiency and overall performance of the turbine due to a greater pressure ratio between the exhaust manifold and the downpipe. The long gradual transition in the downpipe section allows the exhaust gases to maintain their velocity without back pressure build up inside the system. The AMS system includes a fully widened 3-inch upper downpipe, midpipe, and subtle transition pipe to match your factory exhaust components.