It is cold outside. Lots of strange noises at startup.
Do you recall if it made noises when we had those two "hot" days either this past week or the week before?
When the engine warmed up, all the noises disappeared (at least, for my ride)...except the occasional twitter sounds (like chipmunks) from the fan...
I have COBB...
BMWCCA Member # 414198 |E90|SGM|6MT|Premium|Cold|Sport|Tint|LCI MSport Conversion|MTech|Blacklines|219M|PSS|Quaife|Helix FMIC|M3 Suspension|Megan Racing|GC Camber Plates/Coilovers|Eibach 440/800#|AR Catted DP|Cobb AP|StopTech Drilled/Slotted|SS Brake Lines|DWS
Quaife Review: http://www.e90post.com/forums/showthread.php?t=311570