Engineered for the flagship Subaru.
Designed to lower your STI by approximately 25–50 mm, the Spec-S combines fully inverted monotube dampers, digressive valving, and STI-specific spring rates to deliver exceptional precision without sacrificing real-world ride quality.
Dežru Spec-S Coilovers – Subaru STI (2005–2007)
The Dežru Spec-S is engineered specifically for the 2005–2007 Subaru STI, combining premium inverted dampers, digressive valving, and carefully selected spring rates to elevate one of Subaru's most legendary performance platforms. Designed around the STI's rally-inspired chassis, the Spec-S delivers exceptional body control, sharper steering response, and outstanding ride quality while remaining perfectly suited for daily driving.
Unlike conventional upright struts, the Spec-S utilizes fully inverted monotube dampers at all four corners. The larger outer damper bodies dramatically increase suspension rigidity, reducing flex during heavy braking, hard cornering, and rapid transitions. This design also lowers unsprung weight by mounting the heavier portion of the damper to the chassis, improving wheel control and allowing the suspension to maintain grip over rough pavement.
Developed for drivers who enjoy spirited street driving, mountain roads, autocross, and frequent HPDE track events, the Spec-S features digressive piston valving that provides exceptional low-speed body control while remaining compliant over broken pavement, expansion joints, and uneven road surfaces. Instead of relying on excessively stiff springs, the suspension achieves its precision through advanced damping technology, resulting in a car that feels remarkably composed without becoming harsh.
Fixed-length damper bodies paired with a 25–50 mm adjustable lowered ride height preserve proper suspension stroke and geometry, maintaining predictable handling, excellent tire contact, and usable suspension travel throughout the adjustment range.
Key Features
- Inverted monotube dampers front and rear for maximum chassis rigidity, improved steering precision, and superior wheel control.
- Digressive piston valving for exceptional body control while maintaining excellent ride quality.
- Fixed-length damper bodies with 25–50 mm adjustable lowered ride height to preserve suspension geometry and usable travel.
- 20-click rebound adjustment for fine tuning ride comfort and handling characteristics.
- 375 lb/in front and 375 lb/in rear spring rates, selected specifically for the STI chassis and its higher performance capability.
- Linear HyperCoil springs for predictable load transfer and consistent performance throughout suspension travel.
- OEM-style upper mounts to minimize NVH while maintaining factory fitment.
- Hand-built, dyno-matched damper pairs to ensure precise left-to-right damping consistency.
Performance Character
The Spec-S unlocks the full potential of the GD STI chassis by reducing body roll, brake dive, and weight transfer while dramatically improving steering precision and overall stability. Initial turn-in is sharper, mid-corner balance is more predictable, and the chassis remains composed through aggressive transitions without sacrificing everyday comfort.
The fully inverted dampers provide exceptional rigidity under high cornering loads while the digressive valving allows the suspension to absorb rough pavement without upsetting the chassis. Instead of bouncing across imperfections, the tires stay planted, maximizing grip and driver confidence.
Whether attacking your favorite canyon road, participating in an autocross, enjoying a track day, or driving to work Monday morning, the Spec-S delivers a level of refinement and capability that complements the STI's legendary AWD performance.
Why We Recommend 375 lb/in Front & 375 lb/in Rear for the 2005–2007 Subaru STI
The GD STI was engineered as Subaru's flagship performance model, featuring increased chassis rigidity, larger Brembo brakes, a stronger drivetrain, and substantially higher cornering capability than the WRX. Supporting that additional performance requires greater spring support while maintaining the balanced handling characteristics that define the STI.
Our 375 lb/in front and 375 lb/in rear spring package provides the ideal balance between precision, grip, and ride comfort for a street-driven STI that regularly sees aggressive driving.
Rather than relying on extremely stiff springs alone, the Spec-S uses premium digressive dampers to manage body movement during braking, acceleration, and cornering. This allows the suspension to remain remarkably compliant over rough roads while delivering substantially greater chassis control than conventional performance coilovers.
This setup:
- Minimizes body roll, brake dive, and acceleration squat
- Delivers sharper steering response and improved front-end precision
- Increases stability during high-speed transitions
- Maintains excellent mechanical grip over uneven pavement
- Provides outstanding confidence for spirited street driving and regular HPDE use
Combined with fully inverted dampers and advanced digressive valving, the result is an STI that feels more planted, more responsive, and significantly more capable while retaining the ride quality expected from a premium street performance suspension.
