Tein Flex Z Coilover Suspension Kit - Skyline YV37 Top Mounts An OEM part

An OEM part

1640046310

Drop-In cams are indeed drop-in but proper installation (checking all critical clearances and degreeing) and tuning are still necessary and many times may be the difference in the numbers you will see

improved durability characteristics

Tein Flex Z Coilover Suspension Kit - Skyline YV37 Top Mounts An OEM partTein's flagship coilover, the Flex Z includes all the features you'd want on a suspension kit. 16 level damping adjustment, full ride height control and replacement top mounts make Flex Z the complete package. Highly durable, each Flex Z kit features thorough rust proofing and is made of high strength, highly durable steel for added peace of mind.