Bilstein B4 OE Replacement Suspension Strut Assembly

2021 BMW M440i

Part #: 22-306623

Overview

The Bilstein B4 OE Replacement Suspension Strut Assembly is designed specifically for the 2021 BMW M440i, offering a direct fit replacement that restores your vehicle's original ride quality and handling characteristics. Engineered with precision and backed by Bilstein's renowned reputation for quality and durability, these struts are ideal for drivers seeking to maintain or restore their vehicle's factory performance without compromise.

Whether you're a daily driver, a spirited enthusiast, or someone who values consistent, reliable handling, the Bilstein B4 OE Replacement Struts deliver a seamless driving experience. They help ensure your BMW maintains its factory ride comfort, handling response, and safety standards, all while providing the peace of mind that comes with Bilstein's advanced engineering and manufacturing standards.

Key Features

The Bilstein B4 OE Replacement Dampers are crafted to meet or exceed OEM specifications, ensuring a perfect fit and optimal performance. Here are some of the key features that make these struts a top choice for your BMW M440i:

• Designed specifically for the 2021 BMW M440i to provide a direct bolt-on replacement that restores original ride quality and handling.
• Constructed with high-quality steel and durable components to withstand the rigors of daily driving and spirited performance.
• Bilstein's proprietary monotube design ensures consistent damping performance and improved stability under various driving conditions.
• Optimized valving and piston design deliver a balanced ride, combining comfort with precise handling response.
• High power reserves for maximum safety and durability, even during aggressive driving or challenging road conditions.
• OE-grade finish and corrosion-resistant coatings extend the lifespan of the strut assembly, maintaining performance over time.
• Engineered to meet or exceed OE standards, ensuring your vehicle's original handling, safety, and comfort are preserved.

Construction & Design

The Bilstein B4 OE Replacement Strut Assemblies feature a robust monotube design, which provides superior heat dissipation and consistent damping performance. The components are manufactured with precision to exact OEM specifications, ensuring a perfect fit and seamless integration with your BMW's suspension system. The high-strength steel housing and corrosion-resistant coatings enhance durability, making these struts suitable for a variety of driving environments. The design maintains the factory ride height and geometry, ensuring your vehicle handles and feels just like it did when new.

Every strut assembly is assembled with care and undergoes rigorous quality control testing to guarantee reliability and performance. The result is a suspension component that restores your vehicle's original handling characteristics, providing a smooth, controlled ride with excellent road feel and stability.

Installation & Fitment

The Bilstein B4 OE Replacement Suspension Strut Assembly is a direct bolt-on replacement for the original equipment, making installation straightforward for qualified technicians or experienced DIY enthusiasts. No modifications, cutting, or special tools are required beyond standard suspension service equipment. The assembly is designed to fit precisely into your BMW M440i's suspension system, restoring factory ride height and handling characteristics.

It is recommended to replace struts in pairs to ensure balanced handling and optimal performance. Proper alignment after installation is also advised to maintain tire wear and vehicle stability.

What's Included

• Complete OE replacement strut assembly with integrated coil spring (if applicable)
• Mounting hardware and bushings (as per OEM specifications)
• Installation instructions and warranty information

Ideal For

• BMW M440i owners seeking to restore factory ride quality and handling
• Drivers experiencing worn or damaged suspension components
• Enthusiasts who want a reliable, OEM-quality replacement for daily driving or spirited performance
• Those looking to maintain the original factory suspension setup without upgrades or modifications