01bluecls

In the pas couple of nights when im standing outside of my car while its running, I hear a ticking noise coming from the rear of the car. I can hear it within about 10 feet, so its not extremely loud or anything but i can still hear it. I can hear it mostly around the wheel well on the rear drivers side. When i get in the car, I rev the engine a little bit it seems to go away. After shutting the car off for a few seconds after I get get done driving it, I hear a "Pop" when i shut the car off. Are these normal for our CL-S exhausts?? I have never really heard those noises before, or maybe is it just cause its getting colder outside (65 in day to 35 at night)? Im wondering if there is a small exhaust leak, im taking my car into the dealer to have my rotors checked again for warping, should i even mention the exhaust sounds or am I just describing normal things? Any help or expierence is appreciated.