This set of two triangulating bars works with your Cusco rear strut bar to further stiffen the rear of the car. Bolts easily into the trunk, and can be unbolted for when you need to take your friends' luggage to the airport.
Note: Photo above is representative, but it's not of a WRX. Amps and gigantic speaker wire not included.
Fits all 2002-07 Impreza and WRX sedan, including STi. Must be used with the Cusco rear strut tower bar. Includes mounting hardware.