Whiteline’s roll center correction kit features ball joints with longer shanks that drop the lower control arm outer pivot point to bring the control arm to a more stock-like position in a lowered car. The kit also has tie rods with longer shanks to lower the tie rod pivot location by an equal amount so you don’t add any bump steer.
Whiteline is one of the only companies who make parts that correct geometry issues in many different popular cars on the market. They’re a step above your typical bushing replacement company.
The early 2000-2004 GD WRX had steering rack bushings that wrapped around the rack. These were made of very soft rubber and allowed the rack to move from side to side and back and forth a lot. This resulted in a rubbery steering feel, and even a shifting steering center on cars with sticky tires and modified suspensions. In 2005 and later Subaru changed the design of the rack to have vertical rack mounting bolts and captured bushings, which solved the problem.
But if you have an older WRX you have nothing to worry about, because Whiteline has hard urethane rack bushings that increase the clamp load on the rack and keep it from moving to fix the rubbery feeling and shifting rack for good. These bushings are a must have item for all pre-2005 WRXs.