AST Suspension ACC-F1103S 4100 Series Single-Adjustable Coilover Kit

The AST Suspension ACC-F1103S is a performance coilover kit engineered for enthusiasts who demand precise, adjustable handling without compromising street usability. Part of AST's acclaimed 4100 Series lineup, this kit represents a significant step up from fixed-damping coilovers, offering rebound adjustability to fine-tune ride quality and handling balance to suit driving conditions and personal preference.

AST Suspension has built its reputation through decades of motorsport involvement — including programs in WRC, Dakar Rally, and touring car championships — and brings that engineering pedigree to every street coilover it produces. The 4100 Series strikes a balance between daily-driving comfort and track-ready performance, making it an ideal upgrade for spirited street and occasional track use.

Key Features:

• Single-way rebound adjustment for tunable damping feel and handling response
• Monotube or twin-tube construction (application-specific) for consistent, fade-resistant damping
• Ride height adjustability via threaded shock body
• High-quality low-friction seals for precise damper response
• Designed for compatibility with OEM top mounts (application-specific)
• Includes matched springs for optimized spring-damper pairing
• Rebuildable and serviceable by AST-authorized centers
• Manufactured and tested to AST's strict motorsport-derived quality standards

The ACC-F1103S delivers a meaningful handling upgrade over stock suspension, with the adjustability to dial in your ideal setup — whether that's a comfortable daily driver stance or a sharper, more aggressive track configuration.