2005 boxster s - buzzing sound at 3k?

[jester]

Hi Folks,
Got my S a few weeks ago now and its great fun. One quirk I noticed is that if I'm in first gear, and I ease on the throttle and take it to about 3k rpms (I'm maybe doing 20-25mph at this point) I notice a funny buzzy high pitched rattling sound, kind of like a buzz saw or something that is vibrating that isn't supposed to be.

Is this normal? Right at 3k then at 3.1k it goes away... thought maybe it was cams coming on...

Its been making this noise since new (20miles) and now it has 450 miles.

Anyone else notice this?

Thanks
Jester
silver/black s