AST ASTALS-21-021 Adjustable Lowering Springs for 2025 BMW G99 M5 Touring AWD

Vehicle Fitment

• 2025-2026 BMW M5 Touring (G99, 4.4L Twin-Turbo V8 Hybrid S68, xDrive AWD)

Fitment Notes

• Designed exclusively for the G99 M5 Touring wagon body style. Does not fit the G90 M5 Sedan - the G90 uses a separate application (ASTALS-21-017).
• Compatible with BMW's factory Adaptive M Suspension and OEM Electronic Damper Control (EDC). All driver assistance systems and adaptive damper modes remain fully operational.
• The G99 M5 Touring is xDrive (AWD) only - no RWD variant exists for this body style.

Features

• AST Adjustable Lowering Spring (ALS) system - unlike conventional fixed-drop lowering springs, the ALS kit includes an integrated height adjuster allowing continuous ride height fine-tuning within a tested range, even after installation.
• Fully compatible with BMW Adaptive M factory dampers and OEM Electronic Damper Control (EDC) - all comfort, sport, and track damper modes remain active and unaffected.
• Vehicle-specific progressive spring rate, engineered specifically for the G99 M5 Touring's unique weight distribution, longer wheelbase, and wagon-platform load characteristics.
• Progressive spring design strikes the ideal balance between lowering the vehicle and preserving everyday ride quality - firming up proportionally under higher cornering loads without harshness at low speeds.
• Reduces center of gravity compared to the factory spring setup, improving cornering stability, body roll resistance, and overall handling precision.
• Improved steering response and front-end turn-in feel as a result of the lowered ride height and optimized spring rates.
• Direct OEM spring replacement - no modifications to the strut assemblies, dampers, or mounting hardware required.
• Springs manufactured on precision Wafios coiling machines using premium high-tensile spring steel, ensuring long-term durability, consistent spring rate, and resistance to sag over time.
• Designed and manufactured in-house at AST Suspension's facility in the Netherlands, with full quality control from design through production.

Specifications

• Part Number: ASTALS-21-021
• Type: Adjustable Lowering Springs (ALS) - continuously adjustable ride height within tested range
• Fitment Style: Direct OEM spring replacement
• Spring Design: Progressive rate
• Spring Material: Premium high-tensile spring steel
• Height Adjuster: Integrated - adjustable after installation without removing springs
• Front Lowering Range: Adjustable within AST-tested range (refer to AST documentation for confirmed mm values upon product release)
• Rear Lowering Range: Adjustable within AST-tested range (refer to AST documentation for confirmed mm values upon product release)
• Damper Compatibility: BMW Adaptive M factory dampers with OEM EDC
• Drivetrain: xDrive (AWD)
• Manufactured: Netherlands (AST Suspension facility)
• Position: Full kit - Front Left, Front Right, Rear Left, Rear Right

Included Components

• 2x Front adjustable lowering springs with integrated height adjusters
• 2x Rear adjustable lowering springs with integrated height adjusters

Product Description

The AST ASTALS-21-021 Adjustable Lowering Spring Kit is engineered exclusively for the 2025+ BMW G99 M5 Touring - the first M5 wagon ever offered in the United States. Unlike traditional fixed-drop lowering springs that lock you into a single ride height, the AST ALS system incorporates an integrated height adjuster on each spring, allowing the owner to dial in their preferred ride height within AST's tested and validated lowering range. This flexibility is comparable to what coilover systems offer in terms of ride height customization, but at a significantly lower cost and without replacing the factory damper units. Most importantly, the ALS system is fully compatible with BMW's Adaptive M factory dampers and OEM Electronic Damper Control - every comfort and sport damper mode continues to function exactly as BMW intended.

The G99 M5 Touring presents unique engineering challenges for spring developers due to its extended wheelbase, wagon body structure, full-time xDrive AWD system, and plug-in hybrid powertrain adding significant mass compared to conventional M5 platforms. AST addressed this by developing a vehicle-specific progressive spring rate tuned to the G99's precise weight distribution and chassis dynamics. The result is a spring kit that lowers the vehicle's center of gravity and meaningfully improves cornering stability and body roll resistance without introducing harshness or bounce on everyday roads. The progressive design softens low-speed inputs while firming appropriately under the higher forces of spirited driving - matching the performance character of the M5 Touring platform.

Installation uses the factory spring seats and OEM mounting hardware, making this a straightforward upgrade that does not require specialized tools or modifications to the damper assemblies. Once installed, ride height adjustments can be made at any time using the integrated height adjuster - without removing the springs from the vehicle. The springs are manufactured at AST's Netherlands facility on precision Wafios coiling machines using premium high-tensile spring steel, ensuring consistent spring rate performance and long-term durability. For G99 M5 Touring owners seeking an OEM+ stance improvement with full adaptive suspension compatibility, the ASTALS-21-021 is the purpose-built solution from one of Europe's most respected suspension manufacturers.