|  | Strut Tower Bars
The body of the WRX flexes slightly in turns. Strut tower bars connect the tops of the strut towers to make the body more rigid under turning loads. The result is improved turn in and more controlled wheel movement.
The front of the car benefits most from a strut tower bar, because the engine bay has a huge open space to hold the engine (duh). The rear of the car is more rigid, but a strut tower bar there will still increase chassis ridigity.
Wagons and sedans have the same strut tower geometry, so bars will fit either car. Wagon owners may have to trim interior plastic, however.
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