My '07 G35 coupe (w/ sports-tuned suspension) hit 130K miles recently. It's never given me any serious issues and has been solidly reliable.

However, recently it's started developing this strange clicking sound emanating from underneath, toward the rear of the car.

I took it to the dealership for routine maintenance and told them about the clicking and they could not figure it out.

Initially, they thought it might be the shocks, which are close to needing being replaced (which I'm going to do next month). However, they swapped the old shocks for new ones in a road test and they could still hear the clicking.

It's not my brakes, either.

What could it be?

 

Rear Axle-Click. Grease it up and good to go. Common annoyance (since it really isn't a problem) with the first gen Gs.