The ST XA adjustable coilover kit gives you control over both ride height and rebound damping for the AWD (xDrive) BMW 335i, 340i, 435i and 440i. Built by hand by KW in Germany, it offers seamless ride-height adjustment via a friction-optimized polyamide composite spring perch with a stainless-steel insert, plus 16 clicks of rebound damping so you can dial in anything from comfort to a sportier setup. Galvanized zinc-coated steel struts, a hardened chrome piston rod, and an elastomer bump stop with integrated dust protection guard against corrosion and contamination for long service life. Each kit ships preset to KW's dyno-tested factory settings and includes a damper setup manual.
| Type | Adjustable coilover kit (ST XA) |
| Adjustability | Ride height + rebound damping |
| Damping | 16-click manual rebound |
| Construction | Galvanized zinc-coated steel |
| Warranty | 5-year limited, unlimited mileage |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2013-2015 | BMW | 335i xDrive | Base |
| 2016-2018 | BMW | 340i xDrive | Base |
| 2014-2016 | BMW | 435i xDrive | Base |
| 2017-2020 | BMW | 440i xDrive | Base |
