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D2 Racing Air Struts for 2003-2008 Audi S4 AWD 318i The Sports-i is RS-R’s foundationD2 Racing Air Struts for the 2003 2008 Audi S4 AWD allow for adjustment through both the lower mount and inflatable sleeve or double bellow style air bellow which allows for ultimate range of ride height adjustment. Each air shock features a 36 way damping adjustable design for fine tuning of ride quality and responsiveness. Standard Features High Pressure Air Bags: Engineered and designed to match your vehicle. Sleeve type and double bellow type bags