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 approx 2,0kg lighter per rotor then the stock units. GiroDisc 8,7kg vs. 10,7kg for the stock units. These GiroDisc front rotors will work on the Audi A4/S4/S5 (B8) running with a conversion using OEM four piston Brembo calipers found on the Audi Q5 3.0 Turbo.