Milltek OPF/GPF Bypass For Milltek Sport System - BMW 2 Series M240i Coupé (G42 XDrive OPF/GPF Models Only)Fits to Milltek System Requires OPF Bypass Module or Stage 2 ECU Tune Our range of Cat Back systems are perfectly suited to cater for anyone looking to improve their sound and aesthetics, designed as a direct replacement for the original system, available in multiple configurations enabling the owner to choose the increase in volume of their exhaust and or add a more suitably aggressive tone. All our products are made from 304L Aircraft Grade