Audi RS7 C8 4.0 V8 bi-turbo (Non OPF/GPF US/ROW Models) YOC: 2019 - Part: Cat-back Info: Cat Back System Non Resonated (Twin 80mm) with Cerakote Black Oval Trims - (Loudest) Requires OE system to be Cut - Designed for Customers who will be upgrading to Turbo Back in the Future tailpipe design: pipe diameter: 80mm /3,15inch EC-approved: No Race system: No Valvesonic: No Part no.: SSXAU865