The Whiteline Positive Caster Kit for the 02-07 WRX & 04-07 STi is designed to improve vehicle stability by adding 0.5 degree static caster to both front wheels. Whiteline's special, low compliance bushings reduce caster wind-back and maintain tighter tolerances between static and dynamic alignment settings. The additional caster coupled with the firmer bushings serve to dramatically sharpen initial turn-in response, then forcing more consistent alignment angles through the corner due to the reduced bushing compliance.
Whiteline's "Race" version of the Positive Caster Kit incorporates a firmer bushing, that is black in color, for further reduced deflection.The "Race" version is not recommended for street use due to the increased noise and harshness.
FITMENT: Subaru STI 2004-2007, Subaru WRX 2002-2007