AST Suspension ACU-S6209S Series Coilover Kit - 5100

The AST Suspension 5100 Series coilover system delivers high-end, track-ready performance with street-friendly adjustability. Engineered with inverted monotube technology, this proven race design provides exceptional damper strength and improved suspension geometry under heavy lateral and braking loads in both road and track environments.

Key Features:

• 1-way rebound adjustment with 12 distinct positions for clear feedback and customized damping control
• Inverted monotube design with high-pressure nitrogen floating piston prevents cavitation and maximizes performance
• Low-friction seals with permanently mounted adjuster knobs on dampers for easy tuning
• Height-adjustable platform allows ride height customization while maintaining maximum shock stroke
• Designed to use OEM top mounts with rubber bushings for eye-style shock mounts
• Includes matched springs for optimal performance
• Rebuildable construction for long-term serviceability
• Steel cylinder body construction with inverted design for superior strength

The monotube design utilizes a larger piston compared to twin-tube shocks, increasing damper performance and driver feedback for enhanced grip and vehicle control. Optional upgrades include spherical top mounts, DLC diamond-like carbon coated shafts, double digressive pistons, and custom valving to further refine performance characteristics.