General description This Coilovers Suspension Kit is designed specifically for BMW E90 (2004-2011) and E91 (2004-2012) 3 Series models, including various engine options. It is suitable for RWD vehicles only and is not compatible with the M3 model. The kit allows for adjustable height, enhancing the vehicle's stance and performance. Technical specifications Adjustable height: lowering 1-3 inches Top mounts: front - pillow ball top mounts; rear - OE top mounts required Damping: not available Spring rate Front: 10 kg/mm (560 lbs/in) Spring rate Rear: 8 kg/mm (448 lbs/in) Spring length Front: 200 mm Spring length Rear: 180 mm Coilover overall length Front: 485 mm - 520 mm Coilover overall length Rear: 500 mm - 570 mm Shock type: Twin tube Spring Preload: 7-10 mm Installation Professional installation and alignment are suggested for optimal performance. It is recommended to add washers to avoid interference with the engine bar and to drill the rear OE shock top mount upper part to a