BMW F87 M2 Comp - GPF/OPF Delete Pipe with Hi FLow CatsAs the GPF OPF almost acts as a secondary catalyst, we have provided the option to remove this component, similar to a Decat system. This bypass deletes the GPF OPF, removing it from the exhaust system to better improve performance. All our performance exhaust systems are designed with you in mind, and we cater to an ever expanding range of vehicles. We believe in continuous evolution, and our research & development team work throughout the year to