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This is their recommended racing configuration, you will however if in Germany loose the TUV certification.
The part numbers for their springs are in the image. I'm going to be installing mine soon. I'm unsure who makes them for KW.
They recommend 12kg front and 15kg rear rates. Kw ships with 10kg front and 9kg rears as per KW technical team.
I'm running what KW supplies up front and swift 16kg springs in the back. Its a good handeling combo, but I want to lower the front a little more and the heavier rate will help me in my goals.
-Byron