Large Bore Downpipe with Race Hi-Flow Sports Catalyst - For OE Cat-Back (Audi/Seat/VW)*** Not compatible with vehicles which have additional sensor straight off the turbo and the larger turbo flange *** 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,