The best suspension upgrade for cornering?

QA1's made a HUGE difference in my car! i have Firm Feel sway bars also that i personally think are top notch units. weld in sub-frames from UScartool made the biggest difference so far. i am working on a rebuilt box from Firm Feel and some upper arms from them down the road. the last time i autocrossed mine,i outran my dentist in his new '06 amg mercedes.