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OEM springs are linear, but their spring rates are softer than the Eibachs. A progressive spring and a linear spring that have the same spring rate (progressive spring top rating) wont feel the same on the street, the progressive will feel softer. The OEM spring rates are very soft, 3kg/mm up front an 2.4kg/mm in the rear (2.2 for NA). The Eibachs start off harsher than any of these rates, which is why they feel harder.
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