uprated springs and dampers will help a lot with good camber adjustable tops anti lift kit with castor. Then get it all setup for your driving style.
My starlet has tein coilovers and feels very unsure but grips very well due to camber settings although my hubbies GT has D2's that he setup his self in means of camber preload height and castor and he also the tracked it himself and made a great difference too the difference between cars is amazing even without uprating anti roll bars, turn in and feel its amazing..