Arnott's Coil Spring Conversion Kit C-3540 for the 2004-2010 Audi A8 (D3) delivers a seamless, error free conversion of your Audi front and rear air suspension system to steel coil springs. The Arnott kit features strut assemblies with coil springs made from American steel. The US designed and assembled kit also includes Arnott's patented (US Pat. No. 9,329,917) Electronic Bypass Module (EBM) to turn of dashboard suspension warning lights.