Feliz Aniversario Colegio Wisefab Feal Coilover Kit 441 Heavy 10K 5K. BMW E46 Coilover Kit with 10kg Front and 5kg Rear springs. Each shock is designed with Feal Suspension expertise and success in many top level international motorsports and through years of experience tuning various shock brands. Feal Suspension strongly believe that the 441 coilovers have an edge on shock design that gives you confidence and a competitive advantage where needed most.