Took the track bar down, checked it out, greased it and re-installed. The intermittent metallic pop/click is still there but not as frequent. Couldn't get it to pop by bouncing the bumper like I did at the dealer the other day.

Rolled up the window and turned the stereo up...

 

I had the same problem. I put it up on the hoist at work today. IT'S THE PARKING BRAKE CABLE. The passenger side has some play to it. I couldn't replicate the sound when the parking brake was off, but when I put it on and moved the rim/tire back and fourth I could hear the clicking. After moving it back and forth I put it back in neutral then lowered the car. When backing it out the sound disappeared.