I had a broken pipe too, mid 2013 production.
I exchanged both pipes for stage1 exhausts and I am very happy since.
If you stay with originals: drill out the restrictions before fitting them to the car. The engine will breathe much better (but there will be more noise too)

Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life