TODA RACING Up Rate Valve Spring For S2000 F20C F22C 14750-F20-000Brand TODA RACING Series Name Up Rate Valve Spring Product Number 14750 F20 000 Compatible Car S2000 Compatible Models F20C F22C Product Description The need for increased performance has lead TODA RACING to design a single progressive coil spring to replace the STD double valve springs. As well as allowing valve lifts of up to 13. 0mm, the material and the coil springs natural frequency have all been optimized. Can be used up to 13. 0mm of lift