Start searching, there's 100 ways to go about this. Bilstein's and drop coils, true coilovers(lots o' options), air bags, ....
One of the things you want to avoid in either, a driver or a track car, is being oversprung. To stiff of springs will severely change your ride quality. The springs basic purpose is to hold the car up, the damper/shock/strut does almost all of the rest.
Some companies to look into: Koni, Bilstein, KW, Vogtland, STaSis(more track oriented), VMaxx(lowering, but more for show than anything), and there's a few others.
If you don't already have sport suspension, that's another option. It sits a little lower than the standard suspension, and can be used with drop coils more safely.
EDIT: Sport suspension has red struts, standard is black.
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