Accessory belts keep your AC, Alternator, Power Steering/Water pump running in tip-top shape. If you see your belt have stretch/tear marks now would be a good time to replace it to prevent your vehicle from leaving you stranded!
Fitment:
Audi S4 2010-2012
Audi S5 2010-2012
Will Also Fit:
Mercedes CLS55 AMG 2006
E55 AMG 2003-2006
G55 AMG 2005-2011