sleeping stallion

ok i wanna do some suspension work now on my car. i wanna get some sfc and upper and lower control arms.
would that help my time at the track.
i have this friend that is selling me this
Steeda rear strut bar parts # is 555-5751

is it any good i need help what else is good for my car its sitting on c spirngs right now i dont wanna go all out cuz of money but i wanna piece it all up not buy a whole kit.