of course lowering the center of gravity will be the first thing. tires, rims size place a factor. Getting the appropiate sway bar will dramatically increase handing and chassis reinforcements helps out alot!

coilovers
http://www.evasivemotorsports.com/me...tegory_Code=C1

sway bars with reinforcements
http://jhpusa.com/store/pc/viewPrd.a...idproduct=1911

chassis reinforcements
http://www.evasivemotorsports.com/me...tegory_Code=SB

roll cages help alot also. oh, and don"t forget about seats. Yes, non supportive seats will hinder your handling.