Audi RS4 B9 2.9 V6 Turbo Avant (OPF/GPF Models) YOC: 2018 - Part: Cat-back Info: Cat Back Non-Resonated (Louder) with Polished Oval Trims tailpipe design: pipe diameter: 70mm /2,76inch EC-approved: No Race system: No Valvesonic: No Part no.: SSXAU829