there you go
1. M performance
https://www.bmwpartspros.com/oem-par...b3J5IFBhZ2U%3D
2. Bastuck
https://www.bastuck.de/de/bmw-m340ix...g20-limousine/
the link above is the german page, but i am sure you can get this also in usa. on a us car that will sound much more mighty. the videos shown are with eu spec m340i and OPF installed.
dinan is also developing a exhaust. should be ready soon