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What's the spring rate of the Std springs in an NA ?

What does the red dot on the front springs mean ?
What do the blue dots om the rear springs meam ?
I have one blue dot on one spring and the other rear spring has 2 blue dots
on it ?

Thanks

Depending on which source you believe, fronts are ~150-160 lb/in, and rears are 90-100.

The dots are some factory ID code. Nothing significant really I think.