Whiteline Front Control Arm Inner Rear Bushing 2002-2007 WRX / 2004-2007 STI

KCA375 is designed to add +/- 0.5 degree static caster to both front wheels. The special low compliance bushings reduce caster wind-back & maintain tighter tolerances between static & dynamic alignment settings. The additional caster coupled with the firmer bushings serve to dramatically sharpen initial turn-in response - forcing more consistent alignment angles through the corner due to the reduced bushing compliance.