The ultimate suspension for Subaru's flagship performance car.
The Spec-R lowers the STI by approximately 25–50 mm while delivering true 3-way damper adjustment through fully inverted dampers and external reservoirs, giving experienced drivers complete authority over chassis balance, grip, and vehicle dynamics.
Dežru Spec-R Coilovers – Subaru STI (2005–2007)
Built for the drivers who expect race-car precision from their street car.
The Dežru Spec-R is the flagship suspension system for the 2005–2007 Subaru STI. Combining fully inverted monotube dampers, external reservoirs, and true 3-way damping adjustment, the Spec-R delivers the level of chassis control demanded by serious enthusiasts, time attack competitors, and advanced HPDE drivers while remaining refined enough for spirited street driving.
Every Spec-R system is engineered specifically around the GD STI using real-world vehicle data including weight distribution, corner weights, suspension motion ratios, and target ride frequencies. Rather than relying on excessive spring stiffness, the suspension is developed as a complete package where spring rates, valving, and adjustment range work together to maximize grip, stability, and driver confidence.
The external reservoirs provide independent rebound, low-speed compression, and high-speed compression adjustment. Low-speed compression controls chassis attitude during braking, acceleration, corner entry, and weight transfer. High-speed compression manages impacts from curbing, bumps, and rough pavement without upsetting the chassis. Rebound adjustment fine tunes tire loading, corner exit stability, and overall balance, allowing experienced drivers to optimize the suspension for virtually any driving environment.
Key Features
- Fully inverted monotube dampers front and rear for maximum chassis rigidity, improved steering precision, and exceptional durability.
- External reservoirs with true 3-way adjustment featuring independent rebound, low-speed compression, and high-speed compression control.
- Digressive piston technology providing exceptional body control while maintaining tire compliance and mechanical grip.
- 500 lb/in front and 500 lb/in rear HyperCo springs, engineered specifically for the performance capabilities of the STI chassis.
- Fixed-length damper bodies with 25–50 mm adjustable lowered ride height to preserve suspension geometry and maximize available travel.
- CNC-machined aluminum mounts and hardware for reduced weight, precision fitment, and long-term durability.
- Hand-built and shock dyno verified to ensure perfectly matched damping characteristics across all four dampers.
Performance Character
The Spec-R unlocks the full capability of the GD STI chassis. Steering response becomes razor sharp, body motion is tightly controlled, and weight transfer is managed with exceptional precision during heavy braking, rapid transitions, and hard acceleration. The result is a chassis that feels remarkably stable while communicating every available ounce of grip.
Fully inverted dampers dramatically increase suspension rigidity while the external reservoirs provide increased oil capacity and superior thermal management, allowing damping performance to remain consistent throughout extended mountain drives, competitive autocross events, and full track sessions.
Independent high-speed and low-speed compression adjustment gives experienced drivers complete control over how the suspension reacts. Increase low-speed compression to reduce chassis movement and improve transient response while independently softening high-speed compression to maintain grip over rough pavement and aggressive curbing. Rebound adjustment then fine tunes weight transfer and corner exit balance for maximum confidence at the limit.
Whether you're chasing faster lap times, dialing in a time attack setup, or building the ultimate street STI, the Spec-R delivers the precision and consistency expected from a professional-level motorsport damper.
Why We Recommend 500 lb/in Front & 500 lb/in Rear
The 2005–2007 STI was engineered as Subaru's halo performance model, featuring a stiffer chassis, larger Brembo brakes, wider tires, and significantly higher grip potential than the WRX. To fully support those capabilities, the suspension requires greater spring support while allowing the dampers to maximize tire contact and chassis stability.
Our 500 lb/in front and 500 lb/in rear HyperCo spring package provides the ideal foundation for the Spec-R's advanced 3-way damping architecture. The springs provide the support necessary for aggressive driving while allowing the dampers to independently manage body movement, impact absorption, and weight transfer without relying solely on spring stiffness.
This setup:
- Virtually eliminates excessive body roll, brake dive, and acceleration squat.
- Produces immediate steering response and exceptional transient behavior.
- Maintains outstanding grip over rough pavement and aggressive curbing.
- Delivers consistent damping performance throughout extended track sessions.
- Provides enough adjustment range to tune the suspension for spirited street driving, autocross, time attack, or HPDE competition.
Combined with fully inverted dampers, external reservoirs, and independent rebound, low-speed compression, and high-speed compression adjustment, the Spec-R represents the highest level of suspension performance available for the 2005–2007 STI, delivering race-inspired capability without compromising the confidence and drivability that make the platform legendary.
