AST 5100 Series Coilovers

Fitment: 1997-2008 BMW E46 3-Series and BMW Z4 (Universal Fitment)

Part #: ACU-B1101SD

Overview

The AST 5100 Series Coilovers are a versatile suspension upgrade designed for enthusiasts seeking improved handling, ride quality, and customization. Compatible with 1997-2006 BMW E46 3-Series and 2002-2008 BMW Z4 models, these coilovers are ideal for both street driving and track use. Whether you want a balanced daily driver or a more aggressive performance setup, the 5100 Series offers adjustable features to tailor your vehicle’s stance and response. Crafted for durability and precision, these coilovers help enhance your vehicle’s handling dynamics while maintaining comfort for everyday driving. The 5100 Series coilovers provide a seamless blend of performance and usability, making them suitable for drivers who demand control and reliability. Their adjustable nature allows for fine-tuning ride height and damping, giving you the flexibility to optimize your vehicle’s behavior on different road conditions or track environments. Designed with quality materials and engineering, these coilovers support your vehicle’s suspension system for improved responsiveness and stability.

Key Features

The AST 5100 Series Coilovers feature a robust construction and thoughtful design to meet the demands of performance driving. Key features include:

• 1-Way adjustable damping with 12 distinct positions for precise tuning
• High-quality steel and corrosion-resistant coatings for durability and longevity
• Threaded shock bodies for easy ride height adjustment
• Optimized spring rates for balanced handling and comfort
• Designed to improve cornering, stability, and overall ride response
• Compatible with factory mounting points for straightforward installation
• Made in the USA, ensuring quality craftsmanship and reliability

Construction & Design

The AST 5100 Series Coilovers are engineered with precision-machined components and durable materials to withstand rigorous driving conditions. The shock bodies are constructed from high-strength steel with corrosion-resistant coatings, ensuring longevity and consistent performance. The adjustable threaded collars allow for easy ride height customization without compromising structural integrity, while the damping adjustment mechanism provides fine control over ride firmness and response. This thoughtful design supports a wide range of driving styles, from daily commuting to competitive track days.

Driving Feel & Feedback

These coilovers are designed to enhance your vehicle’s handling response and driver engagement. The adjustable damping allows you to tailor the ride to your preferences, providing sharper turn-in, improved stability, and better feedback from the road surface. The result is a more connected driving experience, whether navigating twisty roads or pushing your vehicle on the track.

Installation & Fitment

Installation requires basic suspension tools and should be performed by qualified technicians familiar with BMW chassis. The coilovers are designed for direct bolt-on installation, with factory mounting points retained. Proper alignment is recommended after installation to ensure optimal handling and tire wear.

What’s Included

The package includes a full set of four coilover shocks with adjustable damping, mounting hardware, and installation instructions. Additional components or tools are not typically required but verify fitment against your vehicle’s specifications.

Ideal For

Performance enthusiasts seeking a customizable suspension upgrade for street or track use, aiming for improved handling, ride quality, and vehicle stance.