check your tires. make sure they're a decent tire with a good amount of tread left. if that's good than you can adjust your air pressure so your rears are about equal to the fronts if not higher. you appear to be on custom wheels so i would recomend your pressures be at about 34 even or 34F 32R for normal driving and if your going to compensate for understeer try 32F 36R

http://www.ocaddict.com

thanks beefgg for the sig