Trüpower Golf GTI MK8 Catless Downpipes allow your EA888.4 turbo charged engine to breathe the way it was meant to breathe. Stock downpipes are equipped with catalytic converters which restrict airflow and reduce the output of the turbo charger. Trüpower Motorsports downpipes ensure a massive increase in airflow with the restrictive catalytic converter removed. This will also will ensure an aggressive lower tone engine sound. Most factory downpipes are narrow which also restricts airflow and reduce potential horsepower. Trüpower Golf GTI MK8 downpipes use larger diameter stainless steel piping to ensure increased air flow. Smooth, unrestricted air flow will improve engine performance, improve engine and fuel efficiency, increase throttle response for faster acceleration and maximize power output of your Golf GTI MK8 EA888.4 turbo engine.