FK coilover kit sports suspension BMW 3-series E90 / E91 Limo / Touring Bj. for BMW 3 Series E90 / E91 Limo / Touring 2005 to 2012. FK coilover kit, height-adjustable sports suspension. The FK coilover kits have been in use successfully for almost 25 years and are known for their sporty suspension setup, the highest quality and an outstanding price-performance ratio.