BMW 5 Series M5 + M5 Competition 4.4l Twin Turbo F90 (OPF Modell Cars) YOC: 2020 - 2023 Part: Cat-back Info: Cat Back System inc. OPF/GPF Bypass with Cerakote Black GT-100 Trims - Required Stage 2 ECU Software tailpipe design: Quad 100mm GT100 pipe diameter: 80mm /3,15inch EC-approved: No Race system: No Valvesonic: No Part no.: SSXBM1181