Description
The Dežru Spec-S Coilovers are engineered specifically for the 2005–2007 Subaru Impreza WRX STI, delivering a performance-focused suspension upgrade that combines precise chassis control, responsive handling, and everyday drivability. Designed around the STI's rally-inspired AWD platform, the Spec-S provides advanced damping technology for enthusiasts who demand greater confidence on winding roads, at autocross events, and during regular high-performance driving events (HPDE).
Unlike conventional upright struts, the Spec-S utilizes fully inverted monotube dampers at all four corners. This configuration is designed to improve structural rigidity under demanding cornering and braking loads while supporting precise suspension response. By mounting the heavier portion of the damper closer to the chassis, the inverted design can also reduce unsprung weight and help the wheels respond more effectively to changing road surfaces.
Digressive Damping Technology
The Spec-S features digressive piston valving, engineered to deliver strong damping forces during slower suspension movements while allowing greater compliance over sharp road imperfections. This approach helps control body movement during braking, acceleration, and cornering without relying exclusively on stiff spring rates.
The result is a suspension setup designed to balance handling precision with road comfort. Whether navigating uneven pavement, driving through mountain roads, or enjoying a weekend track session, the Spec-S provides adjustable damping to help tailor the suspension to your driving style.
20-Click Rebound Adjustment
The Spec-S includes 20-click rebound adjustment, allowing drivers to fine-tune how quickly the suspension extends after compression. Rebound settings influence suspension recovery, weight transfer, and overall chassis balance.
Softer settings can provide a more compliant response for everyday driving, while firmer settings can help control suspension movement during more aggressive driving. The ideal setting depends on spring rates, tire selection, alignment, road conditions, and personal preference.
Fixed-Length Damper Bodies and Adjustable Ride Height
The Spec-S uses fixed-length damper bodies with an adjustable ride-height range of approximately 25–50 mm of lowering, according to the supplied specifications.
This design allows ride height to be adjusted while helping preserve appropriate damper stroke and suspension geometry. Correct setup is important to maintain predictable handling, suitable alignment, and adequate suspension travel throughout the adjustment range.
375 lb/in HyperCoil Springs
The system includes 375 lb/in front and 375 lb/in rear linear HyperCoil springs, selected for the performance requirements of the 2005–2007 STI.
Linear-rate springs provide a consistent spring rate through their working range, supporting predictable load transfer and suspension response. Paired with digressive dampers, the spring package is designed to deliver a balanced combination of chassis support, grip, and ride quality for performance-oriented street use.
OEM-Style Upper Mounts and Precision Assembly
The Spec-S uses OEM-style upper mounts intended to retain a factory-like mounting configuration and help limit additional noise, vibration, and harshness compared with some more aggressive mount designs.
Each damper is hand-built and dyno-matched to help ensure consistent damping characteristics across the suspension set. This attention to assembly supports predictable handling and a reliable foundation for further suspension tuning.
Key Features
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Fully Inverted Monotube Dampers: Front and rear dampers designed for improved rigidity and precise suspension response.
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Digressive Piston Valving: Balances body control with compliance over uneven road surfaces.
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20-Click Rebound Adjustment: Allows fine-tuning of suspension recovery and handling balance.
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375 lb/in Front and Rear Spring Rates: Performance-oriented linear HyperCoil springs.
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Adjustable Ride Height: Approximately 25–50 mm of lowering, as specified.
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Fixed-Length Damper Bodies: Designed to support appropriate suspension geometry and usable travel.
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OEM-Style Upper Mounts: Intended to maintain a more street-friendly suspension configuration.
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Hand-Built, Dyno-Matched Dampers: Helps promote consistent damping performance across the set.
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Street and Performance Versatility: Suitable for daily driving, spirited road use, autocross, and select HPDE applications.
Performance Characteristics
The Dežru Spec-S is designed to improve the handling characteristics of the GD-generation Subaru STI by providing more controlled body movement, sharper steering response, and a more composed chassis during demanding driving.
During cornering, the spring and damper combination helps manage body roll and weight transfer. Under braking and acceleration, appropriately adjusted rebound damping helps control suspension recovery and contributes to a more predictable driving experience.
The inverted damper design supports rigidity under cornering loads, while digressive valving is intended to help the suspension remain responsive over uneven pavement. Together, these features aim to maintain tire contact and driver confidence without making the setup unnecessarily harsh for everyday use.
Whether driving to work, navigating winding roads, participating in autocross, or attending occasional track days, the Spec-S offers adjustable suspension performance for drivers seeking a more connected and controlled STI.
Actual ride comfort and handling depend on damping settings, alignment, tires, vehicle condition, ride height, and road conditions.
Why Choose 375 lb/in Front and Rear Springs for the 2005–2007 Subaru STI?
The 2005–2007 Subaru STI is a performance-oriented AWD platform with substantial cornering capability. A well-matched spring and damper combination can help control weight transfer while preserving the suspension compliance needed for consistent grip.
The Spec-S's 375 lb/in front and 375 lb/in rear spring package provides a firm, performance-focused foundation. Rather than relying on spring stiffness alone, the system combines these rates with digressive damping and adjustable rebound to help balance chassis support and impact absorption.
Potential benefits include:
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Reduced excessive body roll, brake dive, and acceleration squat when properly tuned.
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Sharper steering response and more controlled directional transitions.
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Predictable suspension behavior during spirited street driving.
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A balance of chassis control and compliance over uneven pavement.
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Adjustable rebound characteristics for different road and driving conditions.
This spring package is intended for performance-focused use, and the ideal setup will depend on the vehicle's modifications, tire choice, intended driving environment, and driver preferences.
Who Are These Coilovers For?
The Dežru Spec-S Coilovers are designed for 2005–2007 Subaru STI owners seeking improved suspension control without giving up everyday practicality.
They are well suited to:
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Daily Drivers: Improve suspension response while retaining a street-oriented setup.
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Street Performance Enthusiasts: Fine-tune rebound and ride height for winding roads and spirited driving.
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Autocross Drivers: Develop a more controlled suspension setup for quick transitions, subject to competition rules.
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HPDE Participants: Adjust suspension response for occasional track use and performance driving.
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Lowered STI Builds: Achieve a lower stance with adjustable ride height and performance-oriented spring rates.
For the best results, professional installation, a proper wheel alignment, and careful damping adjustment are recommended.
What's Included
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Dežru Spec-S front and rear inverted monotube coilover assemblies
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375 lb/in front HyperCoil springs
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375 lb/in rear HyperCoil springs
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OEM-style upper mounts, as specified
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Rebound adjustment hardware, as supplied with the kit
Confirm the exact package contents and mounting configuration with the seller before ordering.
Vehicle Fitment
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Make: Subaru
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Model: Impreza WRX STI
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Model Years: 2005–2007
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Chassis Generation: GD/GG platform, depending on body style and market
Fitment Note: Verify the exact chassis, body style, market specification, and mounting configuration before purchase. Compatibility with the standard WRX or other Subaru models should not be assumed without confirmation.
