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The FLEX Z coilovers include:
*392lb (7kg) front springs and 336lb (6kg) rear springs
*Ride height adjustment with separate spring preload settings
*16-way damping force adjustment using ADVANCE NEEDLE technology which provides a much wider range of damping force adjustment per click
*EDFC series compatibility
*Proprietary ZT coated damper bodies and 2-layer powdercoating for lower brackets and upper mounts.
Tein was able to bring cost down on the new FLEX Z dampers by making them fully sealed units (non-rebuildable). The biggest benefit to a fully sealed non-rebuildable damper, other than the extremely affordable price, is a maintenance free damper. Although, we strongly recommend periodical inspection of external components such as the seat locks, spring seats, dust boots, and bump stops. Instead of rebuilding the damper, or if a damper fails several years down the line, single replacement dampers can be purchased to minimize downtime.
These are a great option for folks looking for a street oriented coilover with separate ride height adjustments from spring preload. However, while the sealed damper design offers a lower cost, it does prevent any major spring rate changes as the internal valving cannot be altered.