Riaction GP-1 DIGRESSIVE SUBARU IMPREZA WRX / STI VA 15-21 Coilovers

Engineered for the Subaru WRX STI VA, the Riaction GP-1 Digressive Coilover Kit features digressive valving technology designed for responsive street and performance driving. This damping profile delivers firm low-speed control for sharper turn-in, reduced body roll, and improved chassis stability, while maintaining compliance over uneven surfaces—resulting in a ride that stays composed without excessive harshness.

Built for drivers pushing both WRX and STI platforms, this system enhances AWD traction under load, improves corner exit stability, and delivers consistent feedback through aggressive driving conditions while remaining suitable for daily use.

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

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Vehicle Fitment

• Subaru Impreza WRX (2015–2021)
• Subaru Impreza WRX STI (2015–2021)

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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: 8K
• 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.

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International Orders

For international inquiries, contact:
info@riactionshocks.com