General description Coilovers for BMW Z4 Roadster E85 (2003-2009) models including 2.0i, 2.2i, 2.5i, 3.0i, 2.5si, and 3.0si, as well as Coupe E86 (2006-2009) 3.0si. These coilovers provide adjustable height and damping settings for enhanced performance and comfort. Technical specifications Height adjustable: Yes, lowering 25-75mm Damping adjustable: 24 levels of rebound damping force Spring Rate Front: 10 kg/mm (560 lbs/in) Spring Rate Rear: 8 kg/mm (448 lbs/in) Front spring inner diameter: 70.5 mm Rear spring inner diameter: 62 mm Spring length Front: 180 mm Spring length Rear: 170 mm Front top mount: Pillow ball Rear top mount: Standard rubber Spring Preload: 7-10 mm Warranty: 2 years Installation All modifications must be installed by licensed mechanics and in compliance with local modification regulations. Ensure all components are tightened with correct torque specifications before and after installation. Impact wrench is prohibited during installation to avoid loosening or