Whiteline’s strut tower brace connects the rear strut tops, which substantially increases chassis rigidity.  This reduces chassis flex and deflection under hard cornering, which improves the car’s handling. 

This is especially useful in a WRX Wagon because it is missing the rear fire-wall that gives the Sedan’s a more rigid chassis to begin with.

Because this can interfere with your cargo capacity, Whiteline has designed a bar that uses quick-release bolts for quick removal.