if its just the rear spring rate its not the end of the world. hope the dampers haven't been re-valved differently. My friend has an e91 and he was interested in a set..
335 - Íhlins//Swift//M3 front suspension//M3 subframe bushes//Quaife LSD//AR Design Catless//Forge Intercooler//Alcon BBK//Goodridge//AFE//RPI//Fenders - SOLD
M4-Mineral Gray/Full Shakir Orange/DCT/M Ceramic/M Adaptive Susp.