Milltek Sport | Large Bore Downpipes w/ HFC (F80 M3, F82 M4)Milltek F80 M3 Downpipes LARGE BORE with High Flow Cat Milltek Sport 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. Combined with our Hi Flow Sports Cat, you can expect a significant increase in