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I've recently realised a similar issue on my 2002 (8L) S3, I'll be starting a thread in the S3 8L section on this also as it may be a different issue to yours but seems similar in some ways looking at your description. I sometimes at around 20-30mph hear a whining type of sound seemingly coming...

Possibly as it is an 8L that I have, though you'd think the engines not being worlds apart that the need for an aftermarket CAI would be similar.

Is this really the case as others on this forum would have you beleive there is no need as the OEM airbox is totally capable at most some have said to smooth out the inside of the original airbox and us green cotton filter???