Special ordered this car in 2011 to get the manual transmission and some options I couldn't find like the rear seat climate control. In the first year of production, the F10 M Sport package was bundled with the Dynamic Handling Package. It was a very pricey option package (this is why M Sports are rare on '11s) and I didn't order it.
Fast forward four years and I still love this car, but the one thing it was missing was the aggressive look of the front M Sport bumper. After reading about MWPos's conversion, I was inspired to get it done. You can see his post and parts list here
http://f10.5post.com/forums/showthread.php?t=806000
For those considering it, the conversion doesnt require any real mods, but there are a good amount of parts that need to be switched out. The M Sport uses different air ducts, energy absorber, frame, under engine shield and various other parts. The real challenge is finding a body shop that you trust and is willing to take on a project like this.
I was very lucky to find D&V Autobody in Northern VA. I worked with Kevin and Travis who are both enthusiasts, detail oriented and a pleasure to work with. The fit and paint are perfect. If you live in the DC, MD or VA area and are looking for a good body shop, this is your place.
All parts are OEM and I held onto the non-M Sport bumper cover if anyone is looking for a replacement.
First two pictures are before, second two are after.