The GiroDisc 2-piece rotor system is a direct replacement for the OE rotor, no modifications are necessary. The disc will bolt directly to the car and work with OE calipers perfectly. Once the Girodisc system is in place, simply replace the cast iron rotor ring when needed. The average Girodisc 2-piece rotor is approx 2kg lighter per rotor then the stock units. This reduction in rotational and unsprung weight allows for quicker acceleration and suspension response.
Please Note: These GiroDisc front rotors are made specifically to be used on the Audi A6 (C6), S4 (B5) or A4 & S4 (B6/B7) models equipped with the Stasis/Alcon or Stoptech 355x32mm big brake kits.