Where Are these Noises Coming from

Hello All.
I have been dealing with this noise problem for a while and I can not detect it on my own. When I am cruising with my foot off the gas, I hear loud chirping noise coming from underneath my car. Once I put my foot on the gas and accelerate, the chirping goes away. I believe its either from the Exhaust system, or Suspension! But I dont know where. Any Ideas?
Thanks to all in advance!