You may have heard the phrase ‘Coilover Kit’ being bandied about and wondered what it might be. You’ll no doubt be pleased to hear that it’s nothing too complicated: Basically, it’s just shorthand for ‘coil spring over shock’. Without getting all technical, this is a replacement unit, developed by the performance racing industry, to greatly enhance the suspension on an existing vehicle, by using the improved properties that both a hydraulic damping unit and a graded spring, employed in unison, can offer. Pick up the phone and have a chat with one of our expert customer advisors about the best BMW 3 Series (E90/E91/E92/E93) coilovers for you. We sell top BMW coilovers from leading manufacturers AP.