Girodisc Audi 356mm Rear Replacement Rings 20-0259 Rotor to hat mounting system:

Rotor to hat mounting system: D-Bobbin (12 bolt)

Its simple to see that 50% of the new upgraded intercooler would be seeing no ambient air flow

Carbon Fibre Front Scoops: Channel ambient air efficiently into the intake system

Max Gains: +20% HP

Girodisc Audi 356mm Rear Replacement Rings 20-0259 Rotor to hat mounting system:Our 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.