So, no major update as of late. I think the ZHP has either a blown shock or a bad RSM mount. Noise is coming from the right rear as of late and is a lot more pronounced. I thought I had a blown shock a year or two ago and had ordered a replacement from Bilstein. I haven't installed it because the noise at the time vanished. It now may be time to revisit this.

The ZHP may have a new home in the near future as my g/f put in an offer on a house. If all goes through, I'll probably wait to do the work then.