The ST XA coilover kit lets you adjust both ride height and rebound damping on the Audi A4, A5, S4 and S5 (B8). Built by hand by KW in Germany, it offers 16 clicks of rebound adjustment so you can tune the ride from comfortable to sporty, preset to factory-recommended settings and verified on a shock dyno before shipping. Galvanized zinc-coated steel struts and a friction-optimized polyamide composite spring perch with a stainless-steel insert resist corrosion for long-lasting height adjustability.
Specifications
| Type | Coilover kit (ST XA) |
| Adjustability | Ride height + rebound damping |
| Damping | 16-click adjustable rebound |
| Construction | Galvanized zinc-coated steel, monoblock guide system |
| Spring Perch | Polyamide composite with stainless-steel insert |
| Part Number | 18210075 |
| Warranty | 5-year limited, unlimited mileage |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2013-2014 | Audi | A4 | Base |
| 2015-2016 | Audi | A4 | Premium |
| 2015-2016 | Audi | A4 | Premium Plus |
| 2015 | Audi | A4 | Prestige |
| 2009,2013-2014 | Audi | A4 Quattro | Base |
| 2015-2016 | Audi | A4 Quattro | Premium |
| 2015-2016 | Audi | A4 Quattro | Premium Plus |
| 2015 | Audi | A4 Quattro | Prestige |
| 2013-2014 | Audi | A5 | Cabriolet |
| 2008-2010,2013-2014 | Audi | A5 Quattro | Base |
| 2013-2014 | Audi | A5 Quattro | Cabriolet |
| 2015-2016 | Audi | A5 Quattro | Premium |
| 2015-2016 | Audi | A5 Quattro | Premium Plus |
| 2015 | Audi | A5 Quattro | Prestige |
| 2017 | Audi | A5 Quattro | Sport |
| 2010-2013 | Audi | S4 | Base |
| 2014-2016 | Audi | S4 | Premium Plus |
| 2014-2016 | Audi | S4 | Prestige |
| 2008-2013,2017 | Audi | S5 | Base |
| 2010-2013 | Audi | S5 | Cabriolet |
| 2014-2016 | Audi | S5 | Premium Plus |
| 2014-2016 | Audi | S5 | Prestige |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
