A 2251 Front Generation-II Performance Air Springs (Pair) for 2000-2006 (C5) allroad quattro We are proud to present the Audi allroad Generation-II Front Air Springs, exclusively from Arnott, Inc. After extensive technological research and customer feedback, we have created an advanced air spring, which features a unique CNC-machined solid top and lower piston crafted from 6061-T6 aluminum. We specially designed the lower pistons with a progressive design, giving your suspension a higher spring rate when lowered. These revolutionary air springs also feature an aluminum outer sleeve, designed to increase the spring rate, while still providing a smooth controlled ride. Therefore, unlike factory-installed air springs, our Generation-II Front Air Springs boast a more comprehensive design – providing your allroad with superior handling both on and off road. http://www.arnottindustries.com/part_AUDI_Air_Suspension_Parts_yid17_pid124_gid529.html