The Cusco Diffuser Kit offers increased performance two different ways. The first is by stiffening up the rear sub-frame of the Impreza by connecting both sides of the body.
Secondly, the brace can be used with the bracket kit to retrofit the '06 STi diffuser on the older Impreza models to help with aerodynamics.
Items included in Diffuser Kit:
-Cusco Rear Subframe Bar x1
-Cusco Diffuser Bracket Set x1
-Diffuser Bolts x4
-OEM Diffuser x1