Eibachs drop 30mm as stated, but the ride on standard shox is sh*te!!
I have the same set up...was told it was propper set up ie springs and shortened shox but isn't and the car bounces over bumps. The shox are fine...passed MOT 1 month ago but the matching of these 2 is not the best.
I would suggest looking at a kit that is matched up...such as G-max or one of the Viper sets...they are £220-250. If you are paying a garage to fit them, it will cost the same to do the springs as fit a whole set up...so you are only saving £100-130 on getting just the springs...plus if your shox are old then the new range of travell might end them quicker than if on standard.
Which ever way you go don't forget to get the camber and tracking done
