TEIN S.TECH Springs is an excellent step towards suspension tuning. They offer approximately a 1.5 inch drop for a more aggressive appearance. The Tein S-Tech spring increased performance is attained by variance of spring rate and coil design. Driver’s will experience a feeling of increased control, more stability and reduced body roll during cornering. All Tein S.Tech springs are developed to be used in conjunction with OEM or OEM replacement shocks. Each Tein S.Tech Spring is road tested in the US for proper balance between performance and comfort. The line is produced with vanadium (SAE9254V), which is durable lightweight and has properties to retain more spring stroke. Tein S-Tech Spring length is guaranteed not to sag more than 5mm and to be clear of any manufacture defects (see limited warranty for more details).