Tein Flex Z Coilover Suspension Kit - Alphard GGH20W Rays the diamond cutting method is

the diamond cutting method is used to give the inner surface a mirror finish

This allows racers to reliably increase boost and advance ignition timing���without using high-octane racing fuel���for power gains of up to 20%

vending machines and similar

The AN4 to 1/8npt adapters are primarily used for oil feeds

Tein Flex Z Coilover Suspension Kit - Alphard GGH20W Rays the diamond cutting method isTein'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.