The Eibach Pro-Damper Kit (3514.840) is a set of four replacement dampers that the manufacturer says is developed specifically to complement the unique characteristics of Eibach Pro-Kit and Sportline springs. Because the valving is matched to those spring rates, it is built for a lowered Fox or SN95 Mustang, where a stock damper can't keep up. Owners on user forums who paired Pro-Kit springs with Pro-Dampers report a firm but livable ride and better cornering. Expect the lowered stance to need a proper alignment afterward, so plan for that cost up front.
Stock dampers were never designed for lowered springs, and owners on user forums warn that with the Eibach Pro springs and stock dampers (totally unmatched), your car will ride and handle like crap. Matched Pro-Dampers avoid that mismatch for a comparable price. Eibach's own instructions say to install in the reverse order of removal and to torque all fasteners to vehicle manufacturer's specs. Owners recommend pulling the spindle bolts and upper shaft nut on the front struts, and supporting the spindle while doing so.
Yes. The manufacturer states the Pro-Dampers are tuned to pair with Pro-Kit and Sportline lowering springs, so they are intended as a matched set.
Owners on user forums who lowered their Mustangs commonly report needing an alignment afterward, and some needed camber bolts or adjustable parts to bring camber back within spec.
Per the manufacturer, the dampers install in reverse order of removal, and all fasteners should be torqued to the vehicle manufacturer's specifications. Support the vehicle on jack stands and consult a factory service manual for stand locations. Set tire pressure to the vehicle manufacturer's recommendation rather than the tire's sidewall maximum, since the dampers are tuned that way. For rear shocks, the manufacturer's rear Pro-Damper instructions for a related part number say to mount the dust boot at the bottom, because a boot at the top can collect water.
