A lot of people are unaware of the OSS option and think that plug and play or HID is the only choice. The HIDs are sloppy in appearance and are so bright but poorly defined that you can't even make out that they are rings when looking straight on them. Just giving the OP some info he may have not been aware of. I went through quite a few options and wish I had known exactly how different they were beforehand.
2014 M5 Competition Alpine/Sakhir
BMS Tune. Undercover Performance Custom Downpipes & Connector. H&R 10mm Spacers. BMW CF Rear Spoiler. IND Cosmetics. ALP & BEL Radar & Laser.
2011 Space Grey E92 M3 AA Gen 2 Lvl 3 586whp 398wtq SAE (sold)