Bilstein B4 OE Replacement Suspension Strut Assembly

2004–2005 BMW 645Ci

Part #: 22-221490

Overview

The Bilstein B4 OE Replacement Suspension Strut Assembly is designed to restore the original ride quality and handling characteristics of your BMW 645Ci from the 2004-2005 model years. Engineered with precision and backed by Bilstein's renowned reputation for quality and durability, these struts provide a reliable solution for drivers seeking to maintain their vehicle’s factory performance. Whether your existing suspension components are worn or you’re performing routine maintenance, the B4 OE Replacement struts help ensure your BMW drives smoothly, safely, and confidently.

Ideal for daily drivers, enthusiasts, and those restoring their vehicle to factory specifications, these struts are crafted to meet or exceed OE standards. They deliver the same ride comfort, handling, and safety features that your vehicle was originally designed to offer, making them an excellent choice for maintaining optimal driving dynamics without compromising on quality or reliability.

Key Features

The Bilstein B4 OE Replacement Dampers incorporate advanced engineering and high-quality materials to deliver exceptional performance and longevity. Here are some of the key features that make these struts a top choice for BMW 645Ci owners:

• OE-Quality Construction: Designed to match the original equipment specifications, ensuring perfect fitment and seamless integration with your vehicle’s suspension system.
• Monotube Design: Features a high-pressure nitrogen gas-charged monotube construction that provides consistent damping performance and improved handling response.
• Direct OE Replacement: Engineered to restore the factory ride height, handling, and comfort, maintaining your vehicle’s original driving dynamics.
• Durability & Reliability: Built with corrosion-resistant materials and robust components to withstand the rigors of daily driving and varying road conditions.
• Enhanced Safety: Provides optimal control and stability, contributing to safer driving experiences and improved braking performance.
• World-Famous Bilstein Quality: Known globally for superior shock absorber technology, Bilstein ensures each component meets strict quality standards.
• Easy Installation: Designed as a direct bolt-on replacement, requiring no modifications or special tools for installation.

Construction & Design

The Bilstein B4 OE Replacement Strut Assemblies feature a monotube design that offers superior heat dissipation and consistent damping performance. The housings are made from high-strength steel with corrosion-resistant coatings, ensuring long-lasting durability even under challenging driving conditions. The piston rods are precision-machined for smooth operation and minimal wear, while the internal valving is calibrated to match the original factory settings, preserving your vehicle’s handling and comfort characteristics.

These struts are engineered with a focus on maintaining the original ride height and alignment, preventing uneven tire wear and ensuring optimal suspension geometry. The assembly includes all necessary mounting hardware, making installation straightforward and hassle-free for professional mechanics or experienced DIY enthusiasts.

Installation & Fitment

The Bilstein B4 OE Replacement Suspension Strut Assemblies are designed as direct bolt-on replacements for your BMW 645Ci’s original struts. No cutting, drilling, or modifications are required, making the installation process straightforward for qualified technicians or experienced DIYers. Proper alignment after installation is recommended to ensure optimal handling and tire wear. The assembly includes all necessary hardware, and detailed instructions are typically provided to facilitate a smooth replacement process.

• Direct fit for 2004-2005 BMW 645Ci models
• No special tools or modifications needed
• Compatible with factory suspension components

What's Included

• Complete front or rear strut assembly with mounting hardware
• Pre-assembled shock absorber with coil spring seat
• Installation instructions (if provided)

Ideal For

• BMW 645Ci owners seeking to restore factory ride quality
• Drivers experiencing worn or sagging suspension components
• Enthusiasts looking for reliable, OE-quality replacement parts
• Anyone wanting to maintain original handling and comfort