I saw at least one US spec intake box for sale under the private sales forum for N/A cars. Pick up one of those, and if you want better air flow and sound do the carbon filter delete. Since you car is a Euro model, reuse your Euro MAF sensor or I believe you'll get an error code. I'd include the link for the air box, but I'm posting from my phone. Good luck!
19" V713's Staggered, Blacklines, PBX Powerbox, aFe Oiled Drop In, Carbon Filter Delete, MMW CSv2 Muffler, Koni Yellows w/ H&R Sport Springs, CDV Delete, BMW Performance Grill, BMW Performance SSK, BMW Performance Handbrake