turboish sound on a non-turbo car

i have this lil wheen in my engine area, that starts to sound off at certain pedal pressure/rpms...and ya i got intake, and ive been told that thats what it is, and i was wondering did i hook something up wrong or not tight enough or waht ?i dont mind the sound at all...makes methink im fast, but still i was wondering if its harming me...