Tested on: Audi RS6 C7 (13-18) Avant 4.0 TFSi Bi Turbo Quattro We tested 3 brilliant RS6's and their respective systems by Scorpion, Milltek and Akrapovic, each with weight saving properties and outstanding build quality. It all comes down to sound! Scorpion: Cat-back Non-Resonated Exhaust System + Active Valves https://progressiveparts.com/scorpion-rs6-c7-13-18-avant-4-0-tfsi-bi-turbo-quattro-cat-back-non-resonated-exhaust-system-active-valves - - - - - Milltek: Cat-Back Exhaust- Road+ System (Uses OE Tips) – SSXAU579 https://progressiveparts.com/milltek-audi-rs6-4-0-tfsi-bi-turbo-quattro-13-17-cat-back-exhaust-road-system-uses-oe-tips-ssxau579 - - - - - Akrapovic: Please contact us directly for details/pricing. - - - - - 0161 459 0355 https://progressiveparts.com https://facebook.com/progressiveparts https://instagram.com/progressiveparts