Adjust front camber and caster +-1.5deg on the Audi B9 platform with these forged aluminum adjustable control arms from SPC. OE style booted ball joints and bonded rubber bushings maintain factory ride, handling and noise, vibration, & harshness (NVH) parameters. Audi's unique multi-link suspension creates a 'Virtual' SAI. The factory does not publish a specification for caster, but SPC recommends 5deg to 6deg of caster as a preferred angle for tracking and return to center on these cars. For the left hand (LH) side, use #81381. For the right hand (RH) side, use part number #81382. Want to be able to adjust both sides? Use part #81383. Forged 6061-T6 Aluminum construction for maximized strength at minimum weight OE style, maintenance free, bootedball joints Large 18mm threaded adjuster links Replacement pinch bolts included California Residents WARNING