15-21 Subaru WRX

The Flatout Suspension GR40-PRO is a professional-grade rally and rallycross coilover system engineered for serious motorsport competition. Designed for rally racing, rallycross, and mixed-surface performance driving, the GR40-PRO delivers exceptional durability, advanced adjustability, and precise handling in the harshest racing conditions.

Built with inverted shocks, external reservoirs, and advanced bypass valving, the GR40-PRO is designed to withstand the punishment of competitive racing while providing fade-resistant performance and maximum control. With fully adjustable rebound and compression settings, drivers can fine-tune the suspension for tarmac, gravel, dirt, or mixed rally stages.

Key Features

• Motorsport-Grade Construction
  Engineered specifically for rally, rallycross, and professional competition use.
• 0–2” Adjustable Ride Height
  Dial in ride height, stance, and suspension geometry for different racing surfaces.
• Inverted Shock Design
  Provides increased strength, reduced flex, and improved durability under extreme conditions.
• External Reservoir Shocks
  Increased oil capacity improves cooling and reduces damper fade during long, demanding races.
• Advanced Valving & Bypass Pistons
  Tuned for rally performance with improved compliance, stability, and impact control.
• Fully Adjustable 3-Way Damping
  Independently adjust:
  • Rebound
  • High-Speed Compression
  • Low-Speed Compression
• Fully Rebuildable Design
  Built for long-term racing use with complete serviceability and tuning flexibility.
• Electroplated Shock Bodies
  Provides 7–10 years of corrosion resistance for reliable all-weather performance.

Designed For

• Professional rally and rallycross drivers
• ARA and NASA Rally competitors
• Grassroots motorsport enthusiasts
• Drivers seeking maximum durability and adjustability

Customer Benefits

• Rally-proven performance trusted by competitive drivers
• Excellent control on tarmac, gravel, and dirt stages
• Fade-resistant endurance for long race events
• Precision handling with customizable suspension tuning
• Built to survive harsh motorsport conditions and aggressive driving