Downpipes AUDI RS6 C8 Quattro Avant 4.0 TFSI V8 2020+ The BRONDEX® RS6 C8 downpipes are designed to allow for better exhaust flow and reduce backpressure, resulting in improved engine performance. The reduced backpressure enables the turbocharger to spool up more quickly, resulting in quicker acceleration and improved throttle response. The BRONDEX® AUDI RS6 C8 downpipes are designed to be a direct bolt-on replacement for the stock catalytic converter, making the installation process straightforward and quick. The two main options available are catless downpipes and catted downpipes (downpipes with High Flow Sports Catalytic Converters).