Audi RS6/RS7 C8 & S8 - Large Bore Downpipe with Cat & GPF Delete - For MilltekMilltek 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 performance and a noticeable difference in sound aesthetic. All our