Milltek Sport | Downpipe (Catless) BMW M2C F87Milltek Downpipe (Catless) For BMW M2C F87 (2018 Present) Milltek Sport Large Bore Downpipes are perfect when looking to improve both performance and sound. These downpipes are fabricated with a larger diameter than standard OEM parts, meaning that there is significantly more space for more gas to exit the engine and pass through, increasing efficiency. The primary catalyst is removed from the exhaust system to create more of a freer flowing exhaust,