If you install the exhaust before sunset you should be ok, lol....sorry for the sarcasm.
No really, regarding bolt on parts like a muffler/exhaust, it should not effect the engine, probably make it breathe better. Only thing is that you will be tempted to go WOT to hear your full exhaust note.
2008 E92M3-Space Gray
Eisenmann Sport Exhaust_MT/Loaded