K2-Circuit 00-09 S2000 (AP1/AP2)Applications: 00 03 S2000 AP1 04 09 S2000 AP2 Spring Rate: F 16K R 14K Valve: K2 Race Valve This is our standard linear valve. Damper will get stiffer as the strut travels through its range of motion. This can give some harshness with very aggressive curbs. K2 DS1 Valve This is our hybrid valve. We took some characteristics from the Race Valve and our Digressive Valve to give a good mix of both. The damper is a great option for someone driving their