The Koni coilover kit features threaded, adjustable lower spring perches and progressive rate lowering springs.Along with individual adjustable rebound valving.Koni's high performance division in Germany originally developed these special spring and shock absorber kits. The Koni coilover kit features threaded, adjustable lower spring perches and progressive rate lowering springs. Each shock and strut has owner-adjustable rebound valving so you can fine tune the damping force to fit your driving needs. Includes 4 springs, 4 adjustable shocks, and 2 rear spring perches with ride height adjustment.Lifetime warranty to original purchaser with receipt.Available for Make Model Years Trims / Engines Audi A4 QUATTRO 2006 B7, 2007 B7 2.0T VW GOLF JETTA MK4 1999, 2000, 2001, 2002, 2003, 2004, 2005 1.8T, 2.0 8V GTI 337/ 20TH 2002, 2003 1.8T