The Bilstein B14 (PSS) is a front and rear coilover-style suspension kit for the Ford Fiesta ST, pairing monotube gas-pressure dampers with matched springs and a threaded body for ride height adjustment. Owners on user forums consistently point to the monotube design as the main difference from the stock twin-tube dampers, and they describe the shocks and springs as tuned together. Compared with a springs-only lowering setup, the B14 keeps damper control, so the car is less bouncy over large bumps, pitches less under hard shifts, and corners flatter. Owners also say it stays comfortable enough for daily driving, though one described it as a little soft for serious track use. Searches for Fiesta ST monotube coilovers, adjustable ride height kit, and PSS coilover handling upgrade all point to this kit.
Fitment is for the Ford Fiesta ST, and the ST-specific part number is 47-242043. Owners on user forums say the non-ST Fiesta and Mazda 2 kit uses a different number, so do not order the wrong variant. Installation follows a conventional coilover layout: owners report about three bolts at the top and two or three at each lower mount, with ride height set by turning the adjusting nuts. Owners also warn that the rear strut nut is larger than the factory nut and can creak against the tower, and a slight filing of the tower hole plus lubrication is a common fix. For a Fiesta ST owner who wants a lower stance without giving up street manners, this is a practical fit-and-forget upgrade.
Owners on user forums say the ST-specific kit is part number 47-242043 and that the regular Fiesta and Mazda 2 kit uses a different number. Accounts differ on how much the two kits actually vary. Some owners were told the ST version has different travel and valving, while others were told the difference is only in spring mounting. Confirm fitment with the manufacturer before ordering.
Owners on user forums report that the strut nut supplied with this kit is larger than the factory nut and can rub the body at the tower, causing a creak at low speed. The fix that owners describe most often is slightly enlarging the tower hole and applying silicone or lithium grease to the contact area.
Owners on user forums disagree on the rear spring orientation. One owner followed the included instructions, which call for the Bilstein logo to face up. Another installed the spring reversed and reported no issues. Follow the manufacturer's installation instructions and confirm the orientation with the manufacturer if they are unclear.
Owners on user forums describe this as a fairly typical coilover swap, though the rear is more fiddly than the front. Plan on a few hours per corner the first time, and expect to need a 18mm wrench or a crowfoot-style socket for the top shock nut, along with a 6mm Allen key for the damper rod. Owners report torque values of about 25 Nm at the shock mount and about 115 Nm for the lower shock bolt, and recommend replacing the mounting hardware and lubricating the strut nut area during install. Re-check torque after the car has been driven and settled under load. One owner also reported a front wheel bearing that made noise after reassembly, so inspect bearings while the struts are off. Confirm all torque specifications against the manufacturer's installation sheet before you start.
