Expert's advice:
Since late 2018, most BMW models have been manufactured with a Gasoline/Otto Particulate Filter to reduce further the emissions from the vehicle. The Milltek Sport Particulate Filter-Back range is designed to compensate for the sound-reducing qualities of the particulate filter and significantly improve the sound aesthetic of the exhaust system, as well as the performance.
The Milltek OPF bypass for the BMW M5 G90 & G99 will replace the mid-pipe section of the exhaust and remove the OPF filter. Please note that this Milltek OPF bypass requires an ECU Remap or an OPF/GPF Bypass Module.
Mark Hendrikx - Automotive engineer at Mosselman