The B4 OE Replacement (DampTronic) is Bilstein's service replacement damper for BMW chassis that left the factory with electronically adjustable suspension. It retains the original electronic damper interface, so the vehicle's adaptive damping system keeps full function after the swap. Valving comes from Bilstein's OE development work, which holds the damping force range inside what the factory control unit expects and restores original ride quality and handling instead of firming the car up. The damper is a gas pressure twintube finished in black paint, with a stem upper mount and a 14.1 mm eye lower mount, measuring 356.0 mm collapsed and 482.3 mm extended. Spring seat and boot are not included.
| Type | B4 OE Replacement (DampTronic) gas pressure twintube shock absorber |
| Position | Rear left |
| OEM Replacement | Direct replacement for the factory DampTronic electronically adjustable damper |
| Finish | Black paint |
| Upper Mount | Stem |
| Lower Mount | Eye, 14.1 mm |
| Collapsed Length | 356.0 mm (14.01 in) |
| Extended Length | 482.3 mm (18.98 in) |
| Included | Damper only; spring seat and boot not included |
| Pairs With | 20-328962 rear right, 23-328983 front left, 23-328976 front right |
| Quantity | 1 |
| Part Number | 20-328955 |
| Warranty | BILSTEIN Limited Lifetime Warranty, North America, original purchaser, non transferable |
Documents: Installation Instructions (PDF) | Safety Data Sheet (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2023 | BMW | X5 | M50i |
| 2020-2026 | BMW | X5 | sDrive40i |
| 2019-2026 | BMW | X5 | xDrive40i |
| 2019-2020 | BMW | X5 | xDrive50i |
| 2020-2023 | BMW | X6 | M50i |
| 2020-2021 | BMW | X6 | sDrive40i |
| 2020-2026 | BMW | X6 | xDrive40i |
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Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
