The Whiteline anti-dive caster kit 02-07 WRX & 04-07 STI dramatically improves vehicle stability. In stock form the front end of the WRX and STI has a tendency to move around which equate to less then predictable handling. The front end will lift up when accelerating and dive to the ground when braking aggressively. The anti-dive kit, or commonly referred to as the WALK kit, from Whiteline keeps the front end under control and provides the driver with more predictable handling. Whiteline offers three different versions of the anti-dive kit to fit many different types of driving demands. There is a "Comfort" version that is very quiet and great for the daily driver. The "Standard" version sacrifices some comfort for reduced deflection and increased noise.
Finally, the "Race" version incorporates a metal bearing for the least amount of deflection as possible and adds 1/3 of a degree of caster.The "Race" version is not recommended for street use due to the increased noise and harshness. All three of these kits will add 0.5 degrees of caster.