Remove the exhaust restriction of the factory GPF/OPF on your BMW M3 or M4 G8X with this Milltek Sport GPF/OPF Bypass Pipe. The Gasoline/Otto Particulate Filter (GPF/OPF) fitted to OPF-equipped G8X models acts almost like a secondary catalyst, significantly restricting exhaust flow and muffling the exhaust note. This bypass pipe eliminates the GPF/OPF entirely, restoring unrestricted flow through the system.
Designed to fit to a Milltek Sport Axle Back System, this non-resonated bypass pipe delivers a significant improvement in exhaust sound quality and a noticeable reduction in back pressure. Requires a Stage 2 ECU remap or an OPF/GPF bypass module.
Manufactured from 304L aircraft-grade stainless steel and made in the UK. A race product intended for track use.
