ST XTA height- and rebound-adjustable coilover kit with unibal top mounts for the 2008-2013 BMW 1 Series (E82 coupe, E88 convertible) — 128i, 135i and 135is. Ride height is set via a friction-optimized polyamide composite spring perch with a stainless-steel insert; rebound damping adjusts across 16 clicks; and aluminum unibal top mounts improve steering response and allow camber adjustment where applicable. Built by hand by KW in Fichtenberg, Germany, preset to factory-recommended dyno-tested settings, and shipped with a damper setup manual.
| Type | Coilover kit (ST XTA) |
| Adjustability | Ride height + rebound damping |
| Damping | 16-click manual rebound adjustment |
| Top Mounts | Aluminum unibal (camber-adjustable where applicable) |
| Construction | Galvanized zinc-coated steel struts; polyamide composite spring perch with stainless-steel insert |
| Origin | Made in Germany (built by KW) |
| Warranty | 5-year limited, unlimited mileage |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2013 | BMW | 128i | Base |
| 2008-2013 | BMW | 135i | Base |
| 2013 | BMW | 135is | Base |
