One of the most common upgrades on a modified car is mounting Strut Bars. A Strut Bar (also known as strut tower bar or strut brace) is designed to tie the two opposing strut towers together as a single solid unit. The purpose of a strut tower bar is to reduce flex that these towers experience during hard cornering. When taking a turn a car's strut towers normally flex, resulting in bodyflex and losing some traction.

As Strut Tower Bars are designed to keep your strut towers from flexing, they distribute the pressure applied to one strut tower when taking a turn to both towers instead of just one.