Better handling, improved traction and quicker acceleration are just some of the additional benefits of having stronger and stiffer rear control arms.This modification is good for cars as fast as low 11s, and our kit saves you time, money, and aggravation. The lowers will benefit more from upgrading than the uppers, but all stock unmodified control arms are less than adequate at higher performance levels. Select your vehicle and kit from below. We can also provide packages for your complete suspension upgrade.