well, you dont have to do anything u dont want and i dont know how old your shocks are, but lowering more than 40mm on standard shocks really does put alot more strain on them so they would wear out alot quicker, and my opinion is u may aswell save a bit of cash and fit the whole lot whislt its all off the car if u get me, you can get 60/40 kits with shocks for a little over 100 quid