Quote:
Originally Posted by v1nc86
What D3, D4, D5, D6 refers to?
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These refers to the markings on the BMW OEM Sport (ZSP) springs. D = Sport, C = Non-sport, I = x-Drive, etc. The number is different for different models e.g. E90, E91, E92, E93, as well as engine sizes, transmission and various options.