Tein Flex Z Coilover Suspension Kit - IS250 GSE20R Cooling Its primary function is to

Its primary function is to replace or introduce vacuum lines to the turbocharger compressor housing

suitable for the NSX

and the 4-2-1 layout has a strong advantage

Performance gain: 17-20 horsepower (hp)

Tein Flex Z Coilover Suspension Kit - IS250 GSE20R Cooling Its primary function is toTein'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.