Mine made a moaning sound when cold while turning to the left. It would resolve once warmed up. Apparently there is a "Noisy steering" bulletin, and the dealership fixed mine...I think it involved lubricating a dust boot on the steering column. Good luck!
2011 E92 M-Sport 6 Spd Manual BSM/Black Dakota/Dark Burl
Heated Seats / H&K / Sat / Ipod/USB / CA / AST 4100s / M3 Suspension Bits / 18" Forgestar F14 - Gunmetal with Michigan Super Sports / Quaife LSD, etc...etc...