Upgrade the front or rear non-adjustable factory trailing arms on your Porsche 996 and 997 with this pair of fully adjustable arms from SPC Performance. Constructed from forged 6061-T6 aluminum with a hard black anodize finish, they adjust with an easy to reach threaded adjuster and maintain factory ride with SPC's xAxis sealed flex joints which eliminate binding and bushing compliance. When you install these links on the front, you will be able to adjust caster +-1.25deg. SPC has maintained the OE form sothat you will be able to reuse your factory air deflector without modification. When you install these arms on the rear you will be able to adjust set-back +-1/2 inch (+-13mm). Designed for street use as well as the rigors of the track, these arms will letyou put your alignment angles where you want them for the way you drive. Need camber adjustment? Consider SPC's adjustable camber arms, PN# 72610. These SPC arms are designed to work together to make your suspension fully adjustable. California Residents WARNING