Girodisc Audi B9 S4, S5, SQ5 Front RotorsThese GiroDisc 2 piece rotors are a direct replacement for the front rotors on the B9 S4, S5, and SQ5. Our 2 piece, fully floating assemblies help shed unsprung weight and rotating mass from the front axle of the vehicle. The rotor rings are machined from a proprietary casting made of high carbon steel formulated to GiroDisc's specifications. This superior metallurgy results in a rotor that holds up better, and the 72 curved vanes act as a centrifugal