Girodisc BMW F8X 368mm Rear Replacement Rings Weld-On Direct replacement of: OEM Mercedes

Direct replacement of: OEM Mercedes part # 000-421-20-12-07 / 2194210212 / 0004212012

Important Note: Designed for AN ORB (O-Ring Boss) ports

20-0644-00: Deatschwerks DW400

maximized performance

5 S4 incorporates our in-house engineered DroneTrap technology to deliver a truly aggressive exhaust note without any annoying drone or rasp

Girodisc BMW F8X 368mm Rear Replacement Rings Weld-On Direct replacement of: OEM MercedesOur replacement rings are sold in pairs and include replacement hardware. The only parts you will reuse are your existing GiroDisc hats. Please note that unless specifically noted, GiroDisc replacement rings are only designed to work with GiroDisc hats. They are not designed to be used with other brands, including hats from cars equipped with 2 piece rotors from the factory.