I have an 06 STi. My car handles like a go-kart at Auto X. Even before all the mods it handled well. Its all about driving style. I remember my first AutoX i under steered the itshay out of my car. Just get more seat time in your car and you will learn what works and what doesnt. Good Luck!!!
KW V3's w/ Camber Plates F/R
Camber: Front: 3 Degrees
Rear: 1.75 Degrees
** Don't quote me on alignment specs as i cant remember correctly but that ball park.
27mm Front Sway Full Stiff w endlinks
24mm Rear Sway Full Stiff w endlinks
Subframe Lock Down Bolts