EBC Racing 14-19 BMW M3 (F80/F82) / 15-18 BMW M2 (F87) 2-Piece Rear Rotors, Vented, 370mm DiameterUpgrading to an EBC 2 piece disc will shave crucial kilogrammes off a vehicles un sprung rotational mass, leading to sharper turn in, improved tyre road holding, better fuel economy and an increase to BHP at the wheels. Best of all, when the cast iron friction ring becomes worn after a period of use, the outer ring alone can be replaced, allowing the centre hub and stainless bobbins to be re used, reducing long term running costs. Floating SD Rotor OE