Dežru Suspension Spec-R for 05-07 Subaru STI SPECR-0507STI

The Dežru Spec-R Coilovers are a flagship motorsport-inspired suspension system engineered for the 2005–2007 Subaru Impreza WRX STI. Designed for drivers demanding exceptional chassis control, precise handling, and consistent performance under demanding conditions, the Spec-R combines fully inverted monotube dampers, external reservoirs, and independent 3-way damping adjustment in a comprehensive suspension package.

Developed for serious street enthusiasts, autocross competitors, time attack drivers, and high-performance driving event (HPDE) participants, the Spec-R provides extensive suspension tuning capabilities while retaining the versatility needed for spirited street driving.

Each system is engineered around the STI chassis, taking into account vehicle weight distribution, corner weights, suspension motion ratios, and target ride frequencies. Rather than relying exclusively on stiff springs to control body movement, the Spec-R integrates spring rates, damper valving, and adjustment ranges to deliver a balanced combination of grip, stability, and driver confidence.

Fully Inverted Monotube Dampers with External Reservoirs

The Dežru Spec-R features fully inverted monotube dampers at the front and rear, designed to provide structural rigidity, precise suspension response, and consistent performance during aggressive driving. The inverted configuration supports improved resistance to bending loads, helping maintain control and steering precision under demanding cornering and braking conditions.

External reservoirs increase the system's oil capacity and support thermal management during extended periods of high suspension activity. This design helps maintain more consistent damping behavior during track sessions, mountain driving, and other demanding performance applications.

Independent 3-Way Damping Adjustment

The Spec-R features external reservoirs with independent adjustment for rebound, low-speed compression, and high-speed compression. This allows experienced drivers to fine-tune the suspension according to driving conditions, tire characteristics, and handling preferences.

• Rebound Adjustment: Controls the damper's extension response, helping tune suspension recovery, tire loading, and overall chassis balance.

• Low-Speed Compression Adjustment: Helps manage chassis movement during braking, acceleration, corner entry, and weight transfer.

• High-Speed Compression Adjustment: Tunes the suspension's response to sharp impacts, road imperfections, and aggressive curb strikes.

By adjusting these three damping characteristics independently, drivers can develop a suspension setup suited to street use, autocross, time attack, or HPDE events without depending solely on increased spring stiffness.

Digressive Piston Technology

Digressive piston technology is designed to provide strong damping forces during slower suspension movements while allowing the damper to respond more compliantly to faster shaft movements. This characteristic helps balance body control with tire compliance over uneven surfaces.

For the STI, this approach supports controlled weight transfer during braking and cornering while helping the tires maintain contact with the road through changing pavement conditions.

HyperCoil Springs: 500 lb/in Front and Rear

The Spec-R system includes 500 lb/in front and 500 lb/in rear HyperCoil springs, selected for a performance-oriented suspension setup.

The spring rates provide substantial support for aggressive driving, while the adjustable damper system allows drivers to refine how the chassis responds to weight transfer, cornering loads, and road impacts. Final setup suitability will depend on vehicle modifications, tire selection, intended use, and driver preference.

Adjustable Ride Height with Fixed-Length Damper Bodies

The Spec-R 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 independently of the damper body's overall length, helping preserve appropriate suspension geometry and available damper travel when correctly configured.

Proper ride-height adjustment and suspension setup are essential for maintaining predictable handling, suitable alignment settings, and adequate clearance for street or track use.

CNC-Machined Components and Precision Assembly

The system incorporates CNC-machined aluminum mounts and hardware designed for precise assembly and durability in demanding applications.

Each damper is hand-built and shock-dyno verified, helping ensure consistent damping characteristics across the set. This attention to assembly and damping verification supports a more predictable foundation for suspension tuning.

Key Features

• Fully Inverted Monotube Dampers: Front and rear construction designed for rigidity and precise suspension response.

• External Reservoirs: Additional oil capacity and thermal-management support for demanding driving conditions.

• True 3-Way Damping Adjustment: Independent rebound, low-speed compression, and high-speed compression tuning.

• Digressive Piston Technology: Designed to balance chassis control with tire compliance.

• 500 lb/in Front and Rear HyperCoil Springs: Performance-oriented spring rates for the STI chassis.

• Adjustable Ride Height: Approximately 25–50 mm of lowering, as specified.

• Fixed-Length Damper Bodies: Designed to support ride-height adjustment while maintaining suitable damper geometry.

• CNC-Machined Aluminum Mounts and Hardware: Precision-manufactured components for performance applications.

• Hand-Built Dampers: Individually assembled and shock-dyno verified.

• Street and Motorsport Applications: Designed for enthusiast driving, track use, and advanced suspension tuning.

Performance Characteristics

The Dežru Spec-R is designed to help the 2005–2007 Subaru STI deliver more controlled and predictable handling under demanding driving conditions. Its combination of inverted dampers, adjustable damping, and performance-oriented spring rates provides a comprehensive foundation for tuning chassis behavior.

During hard braking, rapid direction changes, and cornering, the adjustable damping allows drivers to refine body movement and weight transfer. On uneven pavement or track curbing, independent high-speed compression adjustment provides additional control over the damper's response to sharp impacts.

The external reservoirs support thermal management during extended high-load driving, while rebound adjustment helps fine-tune suspension recovery and overall balance.

The result is a suspension system intended for drivers who want a high degree of control over their STI's handling characteristics, whether building a dedicated track car or developing a versatile performance-focused street setup.

Actual ride comfort, grip, and handling behavior will depend on damper settings, alignment, tires, ride height, vehicle modifications, and road conditions.

Why Choose 500 lb/in Front and Rear Springs?

The 2005–2007 Subaru STI is a performance-oriented platform designed for responsive handling and demanding driving conditions. The Spec-R's 500 lb/in front and 500 lb/in rear spring package provides a firm foundation for drivers prioritizing chassis support and precise suspension tuning.

When paired with appropriately configured dampers, these springs can help manage body movement during cornering, braking, and acceleration. The three-way adjustment system then allows the driver to refine the balance between body control and impact compliance.

Potential benefits include:

• Improved control of body roll and weight transfer when properly tuned.

• More direct chassis response during rapid directional changes.

• Greater flexibility to adjust damping for different road and track conditions.

• Independent tuning of low-speed chassis movements and high-speed impact response.

• A performance-oriented foundation for autocross, time attack, and HPDE setups.

Important: These spring rates are relatively firm for a street-driven vehicle. Ride comfort and traction over rough roads may be affected, and the ideal settings will depend on the vehicle's weight, modifications, tires, and intended use.

Who Are These Coilovers For?

The Dežru Spec-R Coilovers are suited to Subaru STI owners seeking advanced suspension adjustment and a performance-focused handling setup.

They are particularly appropriate for:

• Track-Day Drivers: Fine-tune suspension behavior for circuit driving and repeated high-load cornering.

• Time Attack Competitors: Adjust rebound and compression characteristics to suit tires, track surfaces, and driving style.

• Autocross Enthusiasts: Develop a setup for rapid transitions and changing grip conditions, subject to competition rules.

• Advanced HPDE Drivers: Refine chassis balance and suspension response as driving skills progress.

• Performance Street Builds: Create a more controlled, sport-oriented setup while retaining the ability to adjust damping.

Because of the firm spring rates and extensive adjustment range, professional installation and suspension tuning are recommended for drivers seeking the best balance of handling, safety, and drivability.

What's Included

• Dežru Spec-R inverted monotube coilover dampers

• External reservoirs with 3-way damping adjustment

• 500 lb/in front HyperCoil springs

• 500 lb/in rear HyperCoil springs

• CNC-machined mounts and associated hardware, as supplied with the kit

Confirm the exact contents, mounting configuration, and included adjustment hardware with the seller before ordering.

Vehicle Fitment

• Make: Subaru

• Model: Impreza WRX STI

• Model Years: 2005–2007

• Chassis Generation: GD/GG platform, depending on body style and market

Fitment Note: Confirm the exact vehicle chassis, body style, market specification, and mounting configuration before purchase. Do not assume compatibility with the standard WRX or other Subaru models without verified fitment information.

Disclaimer: This product is built to order. Please allow approximately 3–4 weeks for production before shipment.