Bilstein B12 (Pro-Kit)

2014–2017 BMW 640i Base L6 3.0L Front and Rear Suspension Kit

Part #: 46-257741

Overview

The Bilstein B12 (Pro-Kit) suspension kit is designed to enhance the handling, aesthetics, and overall driving experience of your BMW 640i. This complete set combines high-performance Bilstein dampers with Eibach Pro-Kit springs, offering a balanced upgrade that improves both ride quality and vehicle stance. Whether you're looking to achieve a more aggressive look or improve your car's responsiveness on the road, this kit provides a reliable and effective solution.

Ideal for enthusiasts who want a moderate lowering of 24-40mm, the B12 (Pro-Kit) delivers a refined driving experience without sacrificing comfort or daily drivability. It’s perfect for spirited street driving, canyon carving, or simply elevating your vehicle’s appearance with a sleek, lowered stance. Designed specifically for the BMW 640i from 2014 to 2017, this kit ensures a perfect fit and optimized performance.

Key Features

The Bilstein B12 (Pro-Kit) combines advanced damping technology with precision-engineered springs to deliver superior handling and stability. Key features include:

• High-quality Bilstein dampers featuring monotube design with digressive piston technology for consistent performance and durability.
• Eibach Pro-Kit springs crafted from high-tensile steel, providing a moderate lowering that enhances vehicle aesthetics and lowers the center of gravity.
• Optimized spring rates for improved handling, reduced body roll, and enhanced cornering capabilities.
• Complete suspension upgrade that maintains factory-like ride comfort while offering noticeable improvements in responsiveness.
• Designed for a balanced ride quality suitable for daily driving, spirited driving, and highway cruising.
• Engineered to work seamlessly with your vehicle’s existing suspension components for an easy, bolt-on installation.
• Manufactured with rigorous quality standards to ensure long-lasting performance and reliability.

Construction & Design

The Bilstein B12 (Pro-Kit) features monotube dampers with a corrosion-resistant coating, ensuring durability and consistent damping performance over time. The Eibach springs are precision-wound from high-tensile steel, providing a consistent spring rate and a clean, even lowering effect. The combination of these components results in a suspension system that not only improves handling but also maintains a comfortable ride quality for everyday use.

The kit’s design emphasizes a moderate lowering of the vehicle, which reduces wheel gap and enhances the sporty appearance without compromising ride comfort or safety. The components are engineered to work together harmoniously, providing a balanced suspension setup that improves steering response, reduces body roll, and enhances overall vehicle stability.

Installation & Fitment

The Bilstein B12 (Pro-Kit) is a bolt-on upgrade designed for straightforward installation. It uses your vehicle’s factory mounting points and requires no cutting or drilling. Basic tools and mechanical knowledge are sufficient for a proper installation, which can typically be completed within a few hours. No special tuning or alignment adjustments are necessary, but a professional wheel alignment is recommended to ensure optimal handling and tire wear.

• Complete suspension upgrade with dampers and springs
• Designed for easy bolt-on installation
• No cutting, drilling, or modifications required
• Suitable for street and spirited driving applications

What's Included

• Bilstein B12 (Pro-Kit) dampers (front and rear)
• Eibach Pro-Kit springs (front and rear)
• All necessary hardware and mounting components
• Installation instructions

Ideal For

• BMW 640i owners seeking a moderate lowering for improved aesthetics
• Enthusiasts wanting enhanced handling and stability
• Daily drivers who desire a balance of comfort and performance
• Drivers looking for a reliable, high-quality suspension upgrade