Milltek Sport | Downpipe (Primary Hi-Flow Cat + Turbo Elbow) Audi RS3 8V (PFL)This downpipe system replaces the primary OEM catalyst for Milltek Hi Flow Sports catalyst in the Audi RS3. The lower density of the sport catalyst allows for exhaust gases to be less restricted and pass through more effectively. The sports catalyst comes equipped with a Turbo elbow which allows for an improved connection to the vehicles turbo. The wide diameter of the outlet allows the turbo to spool sooner increasing performance and improving