OverviewSpeaking of car parts,a coilover is one of the single best things you can do to suppress the shock.Maxpeedingrods has always aimed to stay at the forefront of offering high performance coilovers in UK.This coilover is guaranteed to compatible for BMW Z4 E85. The damper and spring are assembled as a unit prior to installation, and are replaced as a unit when either of the sub-components fails.You can enjoy comfortable riding experience in all road conditions.ApplicationCompatible for2002 - 2008 BMW Z4 E85/E86 (excl. M Models)SpecificationQuantity:2 piece front + 2 pieces rear Spring rate Front:10kg/mm ( 560lbs/in) Spring rate Rear: 8kg/mm( 448lbs/in) Damper: Non adjustable Adjustable height:Yes Adjustable camber plate:No Warranty:one year warranty for any manufacturing defectFeature* Adjustable ride height * Adjustable pre-load spring tension *Pillow ball top mount -- this design helps combat noise while tuning. It also improves the steering feel and response * Most components are made from 6061 aluminum with T6 for increased hardness -- the advantages include excellent strength, and aluminum helps keep the weight down. * Hign Tensile performance spring - Under 600,000 times continuously test, the spring distortion is less than 0.04%. Plus, the special surface treatment is to improve the durability and performance. * All inserts come with fitted rubber boots to protect the damper and keep clean. * Improve your handling performance without sacrifice comfortable ride. * A fast and affordable way to easily upgrade your car\'s appearance. * Easy installation with right tools. * Ideal for any track, drift and fast road and can also be used for daily driving.Note- Hi-performance aftermarket parts; no instruction included; professional installation is suggested. - Please feel free to contact us for whatever we can help; will be replied in less than 12 hours.