This replaces the soft rubber bushing on your steering rack.
Over time, the rubber will become soft and worn out. This leads to play in the steering rack, and will lose the sharp steering response.
By replacing the worn out rubber ones with polyurethane will greatly increase the steering response and feedback.
Impreza GDB and 2004 STi only
Impreza GC8 Sedan and Wagon
Legacy BC / BD / BE Sedan
Legacy BF / BG / BH Wagon