Product details
OVERVIEW
The ST XTA coilover kit for the first-generation Z4 roadster and coupe brings independent height and rebound damping adjustment plus camber-adjustable top mounts to a chassis that responds well to a lower center of gravity.
ST is the value brand of KW Automotive, and every ST coilover is built by hand at KW in Fichtenberg, Germany. The XTA sits at the top of the ST coilover range: height adjustable, with 16 distinct clicks of rebound damping adjustment and aluminum unibal top mounts that also allow camber adjustment. The struts are galvanized zinc-coated steel and the spring perch is a composite polyamide item with a stainless steel insert. The kit ships preset to ST's factory-recommended damper settings.
SPECS
- Damper family: ST XTA (height and rebound adjustable, adjustable top mounts)
- Front lowering range: 0.8 in to 2.0 in
- Rear lowering range: 0.6 in to 1.6 in
- Damping adjustment: rebound, 16 distinct clicks
- Top mounts: aluminum unibal, camber adjustable
- Strut material and finish: galvanized zinc-coated steel
- Spring perch: composite polyamide with stainless steel insert
- Warranty: 5-year limited, unlimited mileage
PARTS INCLUDED
- Front and rear coilover struts with ST race springs
- Aluminum unibal camber-adjustable front top mounts
- Spanner wrench for ride-height adjustment
- ST rebound adjustment knob
- Damper setup manual with ST reference settings
- Installation documentation and technical component report
TECH RESOURCES
- Required: four-wheel alignment after installation and after any ride-height change.
- Required: professional installation with spring compressors and strut service tools.
- Wheel spacers may be needed with stock wheels and tires.
- Does not fit the Z4 M Roadster or Z4 M Coupe.
- Vehicle-specific installation instructions for ST 18220804 ship in the box with the kit.
- Damper setup manual with ST reference rebound settings is included in the box.
- Speed Logic offers professional installation and alignment: request an appointment.
PART NUMBER
- 18220804
VEHICLE APPLICATIONS
| Make | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| BMW | Z4 2.5i Roadster | E85 | M54 2.5L I6 | 2003–2005 |
| BMW | Z4 3.0i Roadster | E85 | M54 3.0L I6 | 2003–2005 |
| BMW | Z4 3.0i Roadster | E85 | N52 3.0L I6 | 2006–2008 |
| BMW | Z4 3.0si Roadster | E85 | N52 3.0L I6 | 2006–2008 |
| BMW | Z4 3.0si Coupe | E86 | N52 3.0L I6 | 2006–2008 |