i say FIRST, fix whats wrong with it..

THAN:

take it out the track, autocross, and find out how it handles and what you dont like about the stock handling. And you can also see what holds up and make sure nothing else breaks.

THAN AND THAN!!

you start buying stuff to help fix what you dont like..

INSTEAD:
of buying a bunch of parts....and throwing them on the car...and have your super stiff db sliding understeering off the track...