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Message: <blockquote data-quote="lonestarl" data-source="post: 1063953639" data-attributes="member: 122261">FYI.Thank you for your inquiry. Our coilovers do have a normal operating noise which sounds similar to a plastic straw going in and out of a plastic to go cup lid. Or it sounds like high pressure fluid. This is a normal noise related to the oil passing through the piston valve and piston rod. Try changing the damping force setting to see if the noise changes with a softer or stiffer setting. You can check to see if your dampers are leaking by looking for oil on the body of the damper. Or remove the dampers from the vehicle, remove the top mount, spring, etc... Then compress the damper by hand. If the damper rebounds to maximum extension, then the damper is working and not fully discharged. This does not indicate condition but it will at least tell you if the damper is "dead" or not. Changing the damping force should change the speed at which the piston shaft moves which is especially evident when the damper rebounds.We do perform a free inspection if you would like to send your dampers in to one of our two service locations. After inspection we will contact you with overhaul price and estimate turn around time. For more details on sending your products in for service please click the following link,http://www.tein.com/service/index.htmlIf you have any further questions, please feel free to ask.Best Regards,TEIN U.S.A. Inc.9798 Firestone Blvd.Downey, CA 90241Phone: 562-861-9161Fax: 562-861-9171<a href="mailto:tus_sales@tein.com">tus_sales@tein.com</a></blockquote>