BC Racing BR RS Coilovers for Porsche Panamera 971 RWD 2016-2022 Y-25-BR-RSLISTING IMAGE IS GENERIC Supplied in default spring rates, at the time of writing are: 9 10. 5KG 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