Girodisc Audi B5 S4 with Alcon, StopTech BBK Front RotorsThese are lightweight two piece rotors that are made specifically to be used on the B5 S4, or B6 B7 S4 A4 with the Stasis Alcon or Stoptech 355x32mm big brake kits. This is a complete replacement of the hat and rotor so you no longer have to source replacements through the defunct Stasis. The central hat section of our rotor is made from strictly U. S. sourced 6061 T6 aircraft specification aluminum. The disc is made from our own proprietary cast