The ST X is a height-adjustable coilover kit for the 2004-2011 Volvo S40 and V50, engineered and built by hand at KW in Germany for confident handling without sacrificing daily ride comfort. It rides on galvanized zinc-coated steel struts with a friction-optimized polyamide composite spring perch and stainless-steel insert for corrosion-free, long-lasting ride height adjustment, and each damper is dyno-tested before it ships. Spring rates and damper tuning are application-specific to the S40/V50.
| Type | Height-adjustable coilover kit (ST X) |
| Adjustability | Ride height |
| Damping | Fixed |
| Construction | Galvanized zinc-coated steel strut, polyamide composite spring perch with stainless-steel insert |
| Made In | Germany (built by KW) |
| Warranty | 5-year limited, unlimited mileage |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2006-2010 | Volvo | S40 | 2.4i |
| 2004 | Volvo | S40 | Base |
| 2004-2005 | Volvo | S40 | i |
| 2004 | Volvo | S40 | LSE |
| 2006-2009,2011 | Volvo | S40 | T5 |
| 2010-2011 | Volvo | S40 | T5 R-Design |
| 2006-2010 | Volvo | V50 | 2.4i |
| 2005 | Volvo | V50 | i |
| 2005-2008,2011 | Volvo | V50 | T5 |
| 2011 | Volvo | V50 | T5 R-Design |
