Lower Control Arm Caster Adjustment, 2004-2008 Forester
KCA375 is designed to add +/- 0.5 degree static caster to both front wheels. The special low compliance bushes reduce caster wind-back & maintain tighter tolerances between static & dynamic alignment settings. The additional caster coupled with the firmer bushes serve to dramatically sharpen initial turn-in response - forcing more consistent alignment angles through the corner due to the reduced bush compliance.
Caster is the backward or forward tilt of the steering axis. Vehicle manufacturers are aware of the advantages of caster and as each new model is released the amount of caster specified increases. High levels of positive caster equate to dynamic negative camber on turn when you need it most. Whiteline continues to put heavy emphasis on additional positive caster when designing new suspension packages.