Tein High.Tech Spring Kit Lexus IS350 GSE31L 3500 FR F-Sport 2014+ TEIN High.Tech springs utilize the latest spring and material technology to optimize comfort, performance, and quality. Designed and tested in North America to be used in conjunction with OEM or similar shocks for excellent ride comfort and slightly increased handling. The line is produced with Vanadium (SAE9254V), which is durable, lightweight, and has properties to retain more spring stroke. High.Tech springs are designed for those seeking a slightly lowered stance while maintaining high ride quality at a reasonable price. Most vehicles will attain a 1.2 inch drop for a more attractive appearance, added performance, and excellent comfort. Includes a one year limited warranty. SPECS Front Rear Base Ride Height (mm) -20 Rate (lbs/in) 325 SP PART P7Q74-0U0 Free Length (mm) 266 Base Ride Height (mm) -10 Rate (lbs/in) 454 SP PART P7Q75-0U0 Free Length (mm) 323