BC Racing BR RN Coilovers for Audi A6 C7 2012-2018 S-14-BR-RNSupplied in default spring rates, at the time of writing are: 11 6KG Please note that these may be adjusted by BC based on customer feedback, if you require a specific spring rate, please contact us. The BR series coilovers use a large 46mm diameter piston in a 53mm diameter damper body to maximise oil capacity. As the damper unit operates the oil contained within heats up. The viscosity of oil changes as its temperature varies which can lead to