Bilstein's B6 Performance front strut assembly is a bolt-on damping upgrade for the BMW X3 and X4, tuned firmer than the factory strut while running on the car's existing spring. This is the right-side unit, built with a twintube internal design and application-specific valving to sharpen control and grip at the car's original ride height.Each damper is tested to meet or exceed OE standards before it ships, and the fixed spring seat carries over the factory design, so it bolts in without extra modification.Important Compatibility InformationThis is the right-side front strut only. The left-side front strut and the rear shock are sold separately.Why Choose B6 Performance Twintube design with application-specific valving Keeps the factory ride height and factory spring, no lowering Fixed spring seat carries over the factory design Gas-pressure damping holds damping force consistent under load What's IncludedBilstein B6 Performance front strut assembly, right side (x1)Installation NotesAfter installing, have caster, camber and any driver-assistance sensors checked and adjusted to specification, along with headlight aim and the load-dependent brake compensator and ABS system. Rubber-mounted damper attachments should be left loose until the car is back on its wheels at ride height. Do not use impact tools on any fastener. Installation should be performed by a qualified suspension specialist. Bilstein's installation instructions (PDF) cover the full procedure.Product Specifications SKU: B009 22-305183 MPN: 22-305183 GTIN: 651860871929 Manufacturer: Bilstein Series: Bilstein B6 Performance Internal design: Twintube Finish: yellow paint Fitment: right-side front strut for the 2018+ BMW X3 and 2019+ X4, sold individually Frequently Asked QuestionsDoes this lower the car?No. The B6 keeps the factory ride height — it's a damping upgrade on the stock spring, not a lowering kit.Is this the left or right side?This listing is the right-side front strut. The left side is a separate part.Will this work on an X3 or X4 with adaptive dampers?Confirm your car's suspension option with your BMP Tuning rep before ordering — Bilstein does not publish an adaptive-damper compatibility statement for this part.Do I need an alignment after installing?Yes. Any suspension work requires an alignment and a check of driver-assistance sensors.