The PowerStop Evolution Geomet coated front rotor for 2004–2009 Audi S4 is a direct-fit replacement finished with Genuine GEOMET 360 for corrosion resistance while maintaining braking performance. Manufactured to original equipment tolerances for weight, vane count and runout, the rotor is 100% dynamic mill-balanced for smooth operation and installs as a bolt-on swap without modifications.

Power Stop 04-09 Audi S4 Front Evolution High Carbon Geomet Coated Rotor