Quick update guys!
Mine have now been remapped to stage 2! Damn what a different car! Performance is great compared to stock and the sound is really nice with the downpipe installed!
I would like to have even deeper sound with more pops and bangs... removing the mid pipe (resonator) and replacing with straight pipe should not be that hard since it has no "bends" but will it do any good to the sound? If that is not enough I will plan to remove the back box which is stock m135i but it is not that easy since the pipes needs to be custom... please feel free to suggest what you think is the way to go
