These will lower your car approximately 35mm to 40mm.

“The Intelligent Coil Spring”
Progressive Rate Springs are the ultimate in spring design.
The principle is simple,

The spring rate increases when you need it (On corners and when under load etc) and decreases when you don’t. You get to have stiff performance springs in the corners and a comfortable ride in the straights.
Your Shock Absorbers will thank you too, as a constantly excessive spring rate can often find Shock Absorbers unable to control the vehicle (lack of rebound control).