Properly adjusted they can, will, and do make noise in some cases. It's totally dependent on what the car wants for pre-load settings. If you have a car that like a negative load, i.e. an air gap on one side, it can and may be a noisy SOB.
Too bad you couldn't take a ride in my friends old car, he's the one that put rubber hose on the cantilever bolt/bar that hits the spring. Car ran 11.00's with the front end off the ground, nice, level and arrow straight.