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My guess is spring codes for each basic category of car (135i, 128i sport package and 128i non-sport) are selected based on the car's weight/options. I think we all know the BMWP springs are that way.
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E82 / BMWP Springs / Koni Yellows / M front control arms / Adjustable front endlinks / M rear guide rods / Whiteline Poly RSFB
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