yup, the collars work well if the bushings aren't too bad. if the bushings are brittle and falling apart in chunks/seperating, then replacements or solids are the answer. noise will be apparent, but it will depend on your level of upgrades as far as other bushings and arms go.

stiff coilovers, solid subframe bushings, solid diff bushings, full rear arms with spherical joints, upgraded bushings in the spindle, sway bars, and chassis bracing bars will definitely make you feel every pebble you drive over. good for feedback, bad for comfort.