Some 4F owners of the german 4F forum and the suspension company at which I work "forced" Eibach to develop a 50/40mm Eibach Sportline Spring kit because we found out that at some 4F the lowering with 30/30mm had the effect that it looked like the back of the car is lower than the front. Eibach developped this 50/40mm Kit for the original Audi dampers with the typical Eibach comfortable setup plus better precise handling. Larkspeed in the UK is as far as I know the distributor of these 50/40mm Eibach springs in the UK

