Strut Bars

A direct result of this is improved chassis rigidity from strut bars (similar to that gained from a lower tie bar); the understeer is reduced, tire wear improved and metal fatigue is greatly reduced in the strut tower area. Following the aftermarket's lead, some manufacturers like Toyota and Nissan have started fitting strut bars to performance models. 

A strut bar or strut brace is a aftermarket car accessory used in conjunction with struts on monocoque or unibody chassis to provide extra strength between the strut towers. 

With a strut suspension system where the spring and shock absorber are combined in the one suspension unit, the entire vertical suspension load is transmitted to the top of the vehicle's strut tower, In general terms, a strut tower in a chassis is a reinforced portion of the inner wheel well and is not necessarily directly connected to the main chassis rails. For this reason there is inherent flex within the strut towers relative to the chassis rails. 

A strut bar is designed to reduce this strut tower flex by tying two parallel strut towers together. This transmits the load of each strut tower during cornering via tension and compression of the strut bar which shares the load between both towers and reduces chassis flex.