Cobb sway bars are designed to greatly reduce body roll and provide a much more predictable handling characteristic without decreasing the ride quality. 

The bars have been carefully balanced and when used as a system, understeer is a thing of the past. To allow the driver to cater the system to their tastes, the rear bar is adjustable which can provide more or less oversteer for given conditions. 

What makes these bars unique is their hollow (tubular) construction which results in a much lighter and technically superior design compared to the lesser solid bar design. This is the very reason why you'll find tubular sway bars used on high-end performance vehicles and race cars. The tubular design is more expensive and more difficult to manufacturer but that should not be any excuse for not offering the best solution possible. 

From even a purely aesthetic point of view, the style of the thick, aggressive 25mm diameter sway bar easily visible from behind the car screams that you're serious about performance!!

Fits: Subaru Impreza STi 2004-2007