These specs don't show how digressive the shocks are, but basically what I'm getting is that the Koni FSDs are lighter in compression (especially at front) and firmer in rebound than the sports are when set at full soft setting (which is where Koni measures their specs, as I understand it). If the sports were adjusted firmer, I expect their rebound rate would first match, and then exceed, the FSD's rebound damping.
The specs Koni provided for the rear sports match the dyno plots I posted for mine - look at the far right end of the graph (highest speed measured is where Koni checks their specs, apparently).
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2001 Boxster
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