Get ready for the track with this four (4) arm set of adjustable upper links for the Audi C6 and D3 platforms. This kit has four arms so you can change camber and caster +-1.5deg on both sides. xAxis sealed flex joints replace the compliant inner bushings with a free pivoting, minimum compliance, joint. You will feel the difference in handling. SPC Arms Feature: Forged 6061-T6 Aluminum construction for maximized strength at a minimum weight OE style, maintenance free, booted ball joints Large 18mm threaded adjuster links Replacement pinch bolts xAxis sealed flex joints replacing overly compliant OE inner bushings with a free pivoting, minimum compliance, joint Don't need the added benefits of our performance arms? Use SPC arm with OE type bushings - part #81373 for two sets of arms to correct both sides of the vehicle, #81371 for the left side, or part #81372 for the right. Need to replace the ball joint boots on these arms? We have replacement kits available! Part No. 81354. Warning: You will also hear the difference, the OE bushings are designed to absorb and negate noise, vibration, and harshness (NVH). This set of arms will transmit road noise into the cabin. California Residents WARNING