Bilstein 20-303334 Suspension Shock Absorber - Rear

Bilstein B4 OE Replacement Shock Absorber Overview

The Bilstein shock absorber part number 20-303334 is engineered for precise suspension performance on select BMW models. Designed to restore original ride comfort and handling, this monotube shock absorber is a direct replacement for vehicles equipped with DampTronic suspension systems.

• Monotube internal design for consistent damping
• Black paint finish for corrosion resistance
• Collapsed length: 14.46 inches (367.2 mm)
• Extended length: 20.99 inches (533.2 mm)
• Upper mount type: Stem
• Lower mount type: Eye 12.1 mm
• Boot and spring seat not included

About the B4 OE Replacement (DampTronic) Product Line

The B4 OE Replacement (DampTronic) series by Bilstein is designed to meet original equipment specifications for vehicles with electronically controlled suspension systems. This product line ensures compatibility with DampTronic technology, providing reliable damping performance and restoring factory ride quality. Part number 20-303334 is part of this series, tailored for BMW models requiring precise shock absorber replacement without altering suspension dynamics.

Detailed Product Description

This Bilstein shock absorber features a monotube internal design, which offers improved heat dissipation and consistent damping characteristics compared to twin-tube designs. The black paint finish protects the shock from corrosion, extending service life. With a collapsed length of 14.46 inches (367.2 mm) and an extended length of 20.99 inches (533.2 mm), it fits the specified BMW models accurately. The upper stem mount and lower eye mount (12.1 mm) ensure proper installation and secure fitment. Note that this shock absorber does not include a boot or spring seat, so these components should be reused or replaced separately if needed.

Compatible BMW Models and Common Applications

• BMW 330e and 330e xDrive
• BMW 330i and 330i xDrive
• BMW 430i, 430i xDrive, and 430i xDrive Gran Coupe
• BMW M440i Gran Coupe and M440i xDrive Gran Coupe

This shock absorber is ideal for addressing issues such as:

• Reduced ride comfort due to worn shocks
• Decreased vehicle stability and handling performance
• Uneven tire wear caused by suspension inconsistencies
• Excessive body roll or bounce during driving
• Noise or leaks from damaged shock absorbers

Installation Notes and Tips

When installing Bilstein shock absorber 20-303334, ensure the vehicle is securely lifted and supported. Verify that the upper stem and lower eye mounts align correctly with the vehicle’s suspension points. Since the boot and spring seat are not included, inspect these components for wear and replace if necessary. Proper torque specifications should be followed to maintain suspension integrity and safety.

Quality Assurance and Warranty

Bilstein shock absorbers are manufactured to meet strict quality standards, ensuring durability and consistent performance. This part is designed as a direct OE replacement, maintaining the original suspension characteristics of your BMW. Please refer to Bilstein’s official warranty policy for coverage details related to part number 20-303334.