Bilstein B4 OE Replacement Suspension Strut Assembly

2021 BMW M440i xDrive

Part #: 22-306623

Overview

The Bilstein B4 OE Replacement Suspension Strut Assembly is designed specifically for the 2021 BMW M440i xDrive, offering a perfect balance of factory-like ride quality and reliable performance. Engineered to meet or exceed original equipment standards, these struts restore your vehicle's handling, comfort, and safety to factory specifications. Whether you're replacing worn-out components or seeking to maintain your vehicle's original driving experience, the Bilstein B4 provides a seamless, direct-fit solution for discerning BMW owners.

Ideal for daily drivers, enthusiasts, and those committed to maintaining their vehicle's factory performance, these OE replacement dampers deliver consistent, high-quality damping characteristics. With Bilstein's renowned engineering and durability, you'll get a product that not only restores your vehicle's original handling but also enhances safety and driving confidence on every journey.

Key Features

The Bilstein B4 OE Replacement Dampers incorporate advanced technology and high-quality materials to ensure durability and optimal performance. Designed with the original vehicle specifications in mind, these dampers provide a precise fit and function, helping to maintain the vehicle's handling dynamics and ride comfort.

• Engineered to meet or exceed OEM standards for fitment, safety, and durability
• High-quality steel construction with corrosion-resistant coating for long-lasting performance
• Direct-fit replacement for easy installation without modifications
• Bilstein's proprietary gas-pressure technology ensures consistent damping performance
• Restores original handling, ride comfort, and safety for the BMW M440i xDrive
• Designed to support the vehicle's factory ride height and suspension geometry
• Manufactured with precision and quality control to ensure reliability and longevity
• Backed by Bilstein's reputation for performance and durability

Construction & Design

The Bilstein B4 OE Replacement Strut Assemblies feature a robust steel housing with a corrosion-resistant coating, ensuring durability in various driving conditions. The internal components utilize Bilstein's proven gas-pressure technology, which provides consistent damping performance and enhances vehicle stability. These struts are engineered with precision to match the original suspension geometry, ensuring proper alignment and handling characteristics. The design emphasizes ease of installation, with a direct-fit assembly that requires no additional modifications, making it a convenient choice for both professional mechanics and DIY enthusiasts.

Installation & Fitment

The Bilstein B4 OE Replacement Suspension Strut Assemblies are designed as direct-fit replacements for the original factory components. Installation is straightforward for qualified technicians or experienced DIYers, as they utilize the existing mounting points and hardware. No cutting, drilling, or special tools are required, and the process typically involves removing the old struts and installing the new assemblies in their place. Proper alignment after installation is recommended to ensure optimal handling and tire wear.

• Direct-fit OE replacement for the 2021 BMW M440i xDrive
• No modifications or special tuning required
• Installation typically takes 1-2 hours per side

What's Included

• One complete OE replacement suspension strut assembly (driver or passenger side)
• All necessary mounting hardware and components for installation
• Installation instructions (if applicable)

Ideal For

• BMW M440i xDrive owners seeking to restore factory ride quality
• Drivers experiencing worn or sagging suspension components
• Enthusiasts who want to maintain original handling and safety standards
• Professionals performing OE replacement or suspension refurbishing