There isn't a CAI for our car yet. Additionally, given the location of the airbox of the car, and the serious lack of room in general in our engine bay, it's going to be a challenge to do so.
Most any of us have done, that I'm aware of, is to remove the intake box and replace the air filter with a cone.
'09 E93 DCT M3 - Jerez on Ext Blk Nov w/Carbon Leather Trim
Custom Tune, OEM Perf Mod, MS Stg 2 Intake, GTS DCT/Euro MDM - MR Hood Vents/sidemarkers, H8 160, tinted tails, Gloss black kidneys w/metallic M fins, V1
WTB: E93 LCI Tails w/harness - Driver heated mirror - Exhaust tips - Driver Door Panel