APR 18-25 Audi A4 Quattro/A5 Quattro/RS5/S4/S5 (B9) Strut Brace Tower

By replacing the factory-stamped aluminum brace with a high-strength tubular chromium-molybdenum alloy steel system, we significantly increase structural support while maintaining ride comfort. Additionally, our cross-brace design links both strut towers, and an integrated turnbuckle allows for precise preload adjustments, further reinforcing the chassis under heavy cornering and acceleration.

The APR Strut Tower Brace for the B9 Chassis A4/5, S4/5, RS4/5, is engineered to enhance chassis rigidity, reduce flex, and improve handling for a more connected driving experience. While many systems prioritize the visual aesthetics of the engine bay, ours is a true performance upgrade designed for real-world handling improvements.

The APR B9 Strut Tower Brace is the ultimate solution for drivers seeking sharper handling, reduced chassis flex, and a more responsive driving experience—all without sacrificing daily drivability!

True to our motto of Performance Without Compromise, this system provides a stiffer front end without introducing unwanted noise, vibration, or harshness (NVH).

Introducing the APR Strut Tower Brace (B9 Chassis - A4/5, S4/5, & RS4/5)

Features

• High-Strength Tubular Cr-Mo Alloy Steel Construction –  Stronger than the factory-stamped aluminum brace for maximum strength and durability, featuring a black powder-coated finish for superior corrosion resistance and lasting performance.
• High-Quality Materials – Constructed from durable 25mm OD / 19mm ID high-strength tubular chromium-molybdenum alloy steel with billet end caps, TIG welding, black powder coating, and all stainless steel hardware.
• Adjustable Preload with Turnbuckle – Fine-tune chassis stiffness to optimize handling for different driving conditions.
• Increased Chassis Rigidity – Reduces flex under load for improved suspension performance and handling stability.
• Direct Bolt-On Installation – No cutting or permanent modifications required, making installation seamless.
• Full Strut Tower Integration – Connects both towers and the firewall for superior structural reinforcement.
• No Compromise on Comfort – Engineered to prevent additional NVH, maintaining a smooth and refined ride.
• Improved Steering Feel – Enhances driver feedback and consistency during aggressive driving.

Vehicle Fitment

• 2017-2020 Audi A4
• 2019 Audi A4
• 2017-2025 Audi A4 allroad
• 2017-2025 Audi A4 Quattro
• 2019-2020 Audi A4 Quattro
• 2018-2024 Audi A5 Quattro
• 2018-2025 Audi A5 Sportback
• 2018-2024 Audi A5 Sportback
• 2018-2019 Audi RS5
• 2021-2024 Audi RS5
• 2019 Audi RS5 Sportback
• 2021-2025 Audi RS5 Sportback
• 2019-2025 Audi S4
• 2018-2025 Audi S4
• 2019-2024 Audi S5
• 2018-2024 Audi S5
• 2020-2025 Audi S5 Sportback
• 2018-2025 Audi S5 Sportback

Please verify exact fitment (engine, submodel, and trim) before purchasing.

Manufacturer Part Number: SUS00027

Images are for illustration purposes only; actual product may vary.

⚠ WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.