Originally Posted by rldzhao
I have ETK which is BMW's official electronic parts catalog. Springs part numbers are based on the options each car has. I can take a look at how many variations there are when I get a chance.
That'd be awesome, it'd be great to have a spring code compendium on the forums, and once we know what kind of spring comes from what we could start getting rate data compiled. It's not that important to know what car with what options I guess, but it'd be cool to have X1 = xxx free length front, xxx lb/in. Those paper tags aren't going to last forever, and right now I'm in the dark about what is even available.
Good for finding cheaters in competition classes that require factory parts too, it's always been a common cheat to grab convertible or loaded-up springs and stick them on a lighter BMW for those kinds of competition classes, and sometimes hard for an unconnected person to know for sure without doing a VIN order