whats that noise

Hey all I installed a AEM short ram intake and now I hear a hissing sucking sound when the peddel is at 3/4 of the way to the floor I checked the hoses for a air leak but nothing was found I even got another air filter thinking there was a hole in it, and the sound happens when the peddel is at a certian position at 3+ rpm's any ideas on why it sounds kinda turbo like .....

its supose to do that.

ditto,
when ur car whistles, you know your car is fast