Coilovers are one of the few modifications that can be made to the Fiesta ST that will improve the cars capabilities without detracting from its daily drivability. Coilovers give the car a more aggressive stance lowering it up to a couple inches while providing tighter handling. Coilovers are designed with a dual shock absorbing system. The outer coil which works like normal springs and the inner reservoir provides a similar effect by utilizing fluids to manipulate the amount of resistance it provides.
Coilovers are the only way to lower a Fiesta ST while actually improving the ride quality. The feel of the road is reduced while the turn in is more responsive and the car gains a more aggressive stance. This makes coilovers the optimal upgrade for users who intend on daily driving their car and occasionally have passengers.