15-21 Subaru STI

The Flatout Suspension Rally Suspension for the 2015–2021 Subaru STI is engineered for competitive rally driving and extreme mixed-surface performance. Featuring inverted shocks, external reservoirs, and advanced 3-way damping adjustment, this suspension system delivers exceptional durability, precise handling, and fade-resistant performance in demanding rally conditions.

Designed for drivers who need maximum control on gravel, dirt, tarmac, and rough terrain, this setup combines long-travel suspension geometry with premium motorsport components for reliable performance under aggressive driving conditions.

Specifications

• Designed specifically for Rally Applications
• Includes:
  • 2 Inverted Front Assemblies with reservoirs
  • 2 Inverted Rear Assemblies with reservoirs

Suspension Features

• 40mm Inverted Shock Inserts
  Built for improved strength, durability, and consistent performance in harsh rally environments.
• External Reservoirs
  Increased oil capacity improves cooling and reduces damper fade during extended use.
• 3-Way Damping Adjustment
  Independent adjustment for:
  • High-Speed Compression
  • Low-Speed Compression
  • Rebound
• Long-Travel Suspension Design
  • 7” Front Travel
  • 6” Rear Travel
• Linear Rate Springs
  • 225F / 225R spring rates
  • Secondary helper springs on rear assemblies
• Radial Bearing Front Assemblies
  Improves steering response and suspension articulation.

Premium Components

• Electro-plated nickel cartridges
• CNC-machined high-flow aluminum pistons
• Stainless steel shims
• Medium-weight synthetic shock oil
• Spherical bearing upper mounts
• Brackets for sensor lines included
• Fully rebuildable and serviceable
• Individual replacement parts available

Customer Benefits

• Designed for competitive rally and mixed-surface driving
• Excellent durability and fade resistance under hard use
• Precise handling and suspension tuning capability
• Increased suspension travel for rough terrain performance
• Fully rebuildable for long-term motorsport use