Engineered for the Lexus GS300, the Riaction GP-1 Digressive Coilover Kit features digressive valving technology designed to enhance both performance and ride quality. This damping profile delivers firm low-speed control for improved handling and reduced body movement, while maintaining compliance over uneven road surfaces—resulting in a ride that feels stable yet comfortable.

Well-suited for street-driven builds, this system provides a lower stance, improved cornering confidence, and more direct road feedback while maintaining the refinement expected from a luxury chassis.

Each kit is constructed using high-quality materials and precision engineering to ensure durability, reliability, and consistent performance.

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Coilover Specifications

• Full-Length Ride Height Adjustment
• 32-Level Damping Adjustment
• Digressive Valving Technology
• Mono-Tube Damper Design
• 52mm Seamless Electroplated Carbon Steel Shock Body
• 20mm Piston Rod (McPherson Suspension)
• 14mm Piston Rod (Non-McPherson Suspension)
• 44mm High-Flow CNC 6061 Aluminum Piston
• Thinned CNC 6061 Aluminum Floating Piston
• Polyurethane Oil Seal
• SAE9254 Cold-Wound Spring
• Multi-Thickness Valving Shims
• Low Gas Pressure Design
• 7.5W Compounded Suspension Fluid
• Fully Rebuildable Construction

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Spring Rates

• Front: 10K
• Rear: 8K

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What’s Included

• Full set of 4 coilovers (front and rear)
• Spanner wrenches
• Damping adjustment knobs

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Warranty

2-Year Factory Warranty against manufacturer defects.