When you go cylinders you sacrifice ride quality. Its normal to have a bouncy ride in a car equipped with cylinders or bags, you should of known that before you got the system. :doh: The noise could be anything. Check the fitment and clearance of the system. Some parts of the system may have been installed real close to other parts of the vehicle cause them to rattle, rub, clunk, bang.. etc. Long time rubbing and banging of parts may lead to damage later on down the road. Also check the lines and see if they are swaying and if they are, zip tie em down and secure em as best you can.