MAX PRO Coilovers for 1986-1992 Mazda RX7 FC3S ~ Ultra High Range Adjustable Damper that lets you swap springs freely without a retune/rebuild & has very even and predictable force changes between our very defined 32 reference points on the infinitely adjustable rebound. ~PRO coilovers for FC3S RX7 are specially designed to be longer than Comp coilovers to allow more useable shock travel and slightly higher ride height. Standard spring rates are 8kg/mm in the front, 6kg/mm in the rear, but custom spring rates are available by request. ~FC coilovers feature a unique slotted top mounting hole for the front knuckles. This allows you to lean the knucles in or out to further adjust camber and KPI separately from the top plate. Slot lockout inserts are included so your adjustment doesnt slip. ~FC Pro camber plates can be rotated to allow caster and camber adjustment at the same time, since there is no camber/caster adjustability on the lower control arms. ~ Fully threaded damper & lower mount allows vehicle height to be adjusted independent of the spring preload and without using a helper spring. We always suggest zero spring preload. ~ Custom spring rates are available to special order in addition to helper springs, & bolt in air bags sold separately. ~ Spherical bearing upper and lower mounts allow suspension to pivot without binding the shocks. While spring upper perch provides independence between the spring and the bearing. ~ Billet T6061 lightweight aluminum Lower mounts are gold anodized with laser logo. ~ Micro Cellular foam progressive bump stops ~ Block letters on the threads are 5mm each, which quickly assist in visually matching left and right height changes.