Good info, mine squeeks time to time but hardly noticeable. I can only hear it if my radio is off and I'm just driving. But with the radio on even at low volume it is not noticeable at allThe reason the coilovers squeak is moisture and metal to metal contact. If you put a preload on the coilovers it actually makes the squeak worse ( I know, I learned the hard way). Best thing to do is lubricate the top and bottom of the spring with something that will last through rain storms and car washes...like grease. Problem is grease attracts debris...so make that decision on your own.
K tuned installs a gasket where the spring contacts the perch to prevent any noise. I've thought about making some for my coilovers but they only squeak through a few speed bumps after I drive the car through a florida storm.