strange noise

ok all of a sudden i've been hearing this strange noise coming from the front of the car i believe. It goes wwrraannt (like the noise your door makes if it needs to be greased up.) kinda hard to describe. Can anyone tell me what this noise is. I only hear it when i get ready to drive. I put the car in first, let out on the clutch and then before i move a foot "wwrraant" So if anyone could help me with this diagnostic it would be great and really appreciated. My friend said it sounds like a suspension bushing. Could this sound effect anything?
 
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well i figured out what the noise was after taking off all the calibers and rebleeding the brakes, it wasnt the brakes nor suspension parts. i noticed that where my exhaust goes over the axle, the little ( n ) portion of the exhaust pipe that goes over the axle, is actually rubbing against the axle on the driver side and passenger side. so i guess that solves my problem of the mystery noise. but my question is, could this hurt anything?

pics for reference (not my exhaust but it will do)
IMG_6167.jpg