So I've had this rattle (more like a knock) coming from the rear of the Z since 2011 and I haven't been able to find the source. It seems louder in cold weather and is most prominent at low speed over irregular/rippled road surfaces. Colder weather may indicate rubber bushing? It may be coming from the drivers side, but hard to tell. I've shaken everything I could under there and re-torqued the shock tower nuts. I finally replaced both of the HICAS links and the ball joints and that didn't fix it. I have some of the hatch panels removed and captured this video clip with my cell phone laying in the hatch yesterday.
I'm starting to think one of the KYB AGX shocks is making this noise. Does this sound familiar to anyone?