HELP PLZ~!! Injen CAI sound

Hi,
My car is 2003 Honda Accord, 4 cyl.
I just installed the CAI into my car yesterday.
It sounds great and I can notice the HP gain too.
However, the small "Woooooo" sound shows up after I turn the engine on even when the car is in the idle mode.
It's kind of annoyed right now.
Is it normal to have that sound? (I hope not)
Is there anyway to fix that?
THX

At idle there should be a sucking noise, almost like a vacuum...I don't know if I'd describe that as a Woooo....

i installed mine last night..i havent heard anything like that...of course mine isnt Injen, but id check the install...may not be on there right