Jet-like noise coming from under hood
 

First post, first BMW, sorry if I posted in the wrong area. (and if it drags on..)

Just purchased a 03' 325ci 2 months ago w/120,000 mi. at purchase. Everything with the car is running great and I have no check engine light on, but about a month ago when the temperature dropped at night in my area my car would make a whiney jet-like noise the next day. It would only last for about 10 seconds then go away.
But 2 weeks ago the noise has started to prolong and now goes on for about 2-4 minutes (or until my car is fully warmed up). I've done some research and the symptoms point to the Secondary Air system, but I have no clue :confused:

Car is a manual trans..

Anyone know where the secondary air pump is located so I can check it for rips or holes? I know it's only getting worse. Will post a video later tonight

CCV with 4 new hoses...

There it is...

happen to me today ill post a video http://www.youtube.com/watch?v=_0CMy...ature=youtu.be

ive been getting the same exact noise on my 01 325i. have u found the culprit yet?

what im i watching?

Just hear the noise nothing too watch

That noise is from the secondary air pump my rubber hose torn of while i was changing my vcg from yesterday will report tomorrow when i fix the problem

Is this the sound you hear?

http://www.youtube.com/watch?v=D77J2...3507CF9AE6C227

at the .21 sec mark:
http://www.youtube.com/watch?v=krE_A...6C227&index=17