Improve suspension performance on the 2006-2010 BMW M5 E60 with the Dinan Supplemental Ride Quality & Handling Kit. Designed to work with Dinan performance springs, this kit uses tuned progressive-rate bump stops to maximize suspension travel, improve ride quality, and reduce the chance of harsh bottoming when the vehicle is lowered. Includes four OE-quality bump stops tuned specifically for Dinan springs. Part number: D193-6017. Dinan lists 9.3 hours labor when installed by itself, with negligible additional labor when installed with the corresponding Dinan spring set.