The Bilstein B8 Performance Plus rear shock is a direct bolt-in upgrade to the factory rear shock, engineered to work with aftermarket lowering springs instead of the factory-height setup. Application-specific monotube valving gives it firmer, more controlled damping than the stock shock while keeping the ride composed once the car is lowered.It's built for owners who already run, or plan to run, lowering springs and want the rear damping matched to that spring rate.Important Compatibility InformationThis shock is sold individually, two are required for a complete rear axle, and it does not include a spring seat, so it installs with your lowering spring's own perch. It pairs with the Bilstein B8 Performance Plus Front Strut to complete a matched front and rear performance set.Why Upgrade Monotube internal design for consistent damping control under hard use Application-specific valving tuned for aftermarket lowering springs Yellow powdercoated finish, engineered and built in Germany What's IncludedBilstein B8 Performance Plus rear shock, sold individuallyRequired, not included: aftermarket lowering springs, spring seat/perch hardware, and a second rear shock for the opposite side.Installation NotesBilstein publishes official installation instructions for this shock.Product Specifications SKU: B009 24-229937 Bilstein MPN: 24-229937 GTIN: 651860727837 Damper design: Monotube Shock weight: approximately 4.1 lbs Application: MK7 Golf, GTI, Golf R & Golf Alltrack/Sportwagen and Audi 8V A3/S3 (MQB platform) Frequently Asked QuestionsDo I need one or two of these shocks?Two. This shock is sold individually and covers one side of the rear axle, so a complete rear installation needs two units.Does this shock include a spring seat?No. It installs with the perch or seat that comes with your lowering springs.Do I need the front strut too?Not necessarily, but pairing this rear shock with the matching B8 Performance Plus front strut keeps damping balanced front to rear rather than mixing a performance rear with a stock front.Will this work with stock-height springs?This shock is valved for use with lowering springs. Running it with tall factory-height springs is not the intended application.Not sure which Bilstein shock fits your car?Contact your BMP Tuning rep to confirm fitment before you order.