Trüpower Motorsports Toyota Supra MKV A90/A91 B58 4.5” Catless Downpipes (2020+) allow your B58 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 Toyota Supra MKV A90/A91 B58 4.5” Catless 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 B58 engine.