Bilstein 46-181121 Suspension Kit - Front and Rear

Bilstein B12 (Pro-Kit) Suspension Kit

The Bilstein B12 (Pro-Kit) suspension kit combines Bilstein Performance dampers with Eibach Pro-Kit springs for a fixed-height lowering setup. This package is tuned for specific applications and delivers a moderate drop of about 24-40 mm, depending on the vehicle.

Built for the BMW 545i and BMW 550i, part number 46-181121 provides a matched suspension solution that balances ride control, stance, and everyday drivability. The monotube damper design and yellow damper finish with dark grey springs identify the B12 (Pro-Kit) series.

• Complete suspension kit with dampers and lowering springs
• Bilstein monotube internal design for consistent damping response
• Moderate lowering range of 24-40 mm, application dependent
• Application-specific tuning for fixed ride height
• Yellow dampers and dark grey springs
• Part number 46-181121

B12 (Pro-Kit) Product Line Details

The Bilstein B12 (Pro-Kit) line pairs Bilstein dampers with Eibach Pro-Kit springs to create a coordinated suspension package. For BMW 545i and BMW 550i fitments, this approach supports a lower stance without changing the vehicle’s basic suspension layout, making it a direct choice for drivers seeking a controlled drop and a more refined road feel.

This part cross-references Eibach part numbers E10-20-011-03-22 and E90-20-011-03-22 for the same application.

Fitment

• Fits 2004-2005 BMW 545i, front and rear, without electronic or self-leveling suspension.
• Fits 2006-2010 BMW 550i, front and rear, without electronic or self-leveling suspension.

Common Uses

• Replacing worn dampers and springs with a matched suspension kit
• Lowering ride height on BMW 545i and BMW 550i applications
• Restoring consistent damping response after suspension wear
• Addressing uneven stance caused by aging springs or dampers
• Improving suspension control with a fixed-height setup

Installation Notes

Verify that the vehicle does not have electronic or self-leveling suspension before ordering. This kit is specified for front and rear installation on the listed BMW applications, and the final ride height will vary by vehicle and configuration within the stated lowering range.

Quality Assurance

Bilstein B12 (Pro-Kit) suspension kits are built around Bilstein Performance dampers and matched springs selected for each application. The monotube damper construction supports consistent performance across the intended fitments.