So today am starting on major suspension refresh of my 05 ZHP. I bought the BMW performance suspension kit (OEM stuff) for $500 and going to replace front struts, rear shocks, control arms, & rear shock mts. I also bought Powerflex CAB's preset in housings, and Powerflex RTABs!
Working on it by myself & still have a few tools to borrow, so may take a while & plan to tackle 1 corner at a time. Will update post w/ photos.
Wish me luck!
Chuck