well to those people posting "short tube" intakes, (not sure if i should say 'ram-air'), the stock intake pulls cold air with the snorkel, just like the most recent one shown. however, the longer tube puts the intake in a bath of cold air from beneath the engine, so its just a more efficient way of getting at the cold air. however, i have read a few things that may suggest the longer tube style of intake makes its gains in the pattern of air flow, as well as the decreased air temp. This means that the longer tube smooths out the air flow which works better with the MAF, allowing the DME to adjust better to the different intake and air delivery.
KW V1 Coilovers/ 3.38 Diff/ BMW SSK/ TMS Subframe Reinforcement/ Eisenmann Race/ Bimmberbrakes Gen3 Equal length headers/ Stoptech Rotors & Pads/ M3 Motor Mounts/ VMR V710