Tein S-Tech Lowering Springs 03-UP Toyota Corolla Drops 2.3fr 2.4rr Product Model: TE-SKL00-AUB00 Tein S-Tech spring is an excellent step towards suspension tuning. It offers approximately a 1.5 inch drop for a stylish look and increased road capability.. All applications has been road tested in the US for proper balance between performance and comfort. This line of Tein S-Tech is produced with Vanadium, which is durable, lightweight, and designed to retain more spring stroke.