Balanced daily comfort with real back-road capability.
Designed to lower your STI by approximately 25–50 mm while maintaining composure over real-world roads, the Spec-S sharpens turn-in and body control without beating you up on the commute.
Dežru Spec-S Coilovers – Subaru WRX & STI (VA Chassis, 2015–2021)
The Dežru Spec-S coilover system is engineered specifically for the Subaru WRX and STI VA chassis, a capable AWD platform that benefits greatly from balanced spring rates and modern damper tuning. Designed around the VA’s suspension geometry, curb weight, and all-wheel-drive traction, the Spec-S delivers improved stability, sharper response, and greater confidence without sacrificing daily drivability.
Developed for drivers who daily their WRX or STI but still enjoy spirited street driving, back roads, autocross, and occasional HPDE track days, the Spec-S features digressive piston valving that provides strong low-speed chassis support during braking, turn-in, and transitions, while remaining compliant over rough pavement, expansion joints, and uneven surfaces. Rather than relying on excessive stiffness, this setup targets a balanced ride frequency in the ~1.9–2.2 Hz range, improving control and feedback while keeping the car comfortable on real roads.
Fixed-length inverted damper bodies paired with a 25–50 mm adjustable lowered ride height preserve proper suspension stroke and geometry. This maintains usable bump travel and predictable roll behavior, allowing the VA chassis to remain composed, stable, and confidence-inspiring during both daily driving and aggressive use.
Key Features
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Digressive inverted monotube dampers for controlled body motion, consistent damping performance, and clear driver feedback.
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Fixed-length damper bodies with 25–50 mm adjustable lowered ride height to preserve suspension geometry and usable travel.
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Adjustable damping to fine-tune rebound for daily driving, spirited street use, autocross, or HPDE track events.
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450 lb/in front and 450 lb/in rear spring rates, selected to deliver a neutral, predictable balance that enhances body control without making the car harsh or nervous.
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Linear HyperCoil springs for predictable load transfer and smooth, consistent response throughout suspension travel.
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OEM-style upper mounts to minimize NVH while maintaining proper fitment and alignment consistency.
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Hand-built, dyno-matched pairs to ensure precise left-to-right damping consistency.
Performance Character
The Spec-S transforms the VA WRX and STI by reducing excess body motion and improving overall chassis composure while retaining the AWD confidence and everyday comfort the platform is known for. The digressive damping profile provides immediate support during initial inputs, paired with controlled compliance that keeps all four tires planted as grip levels rise.
The result is a WRX or STI that feels balanced, predictable, and confidence-inspiring, remaining comfortable for daily driving while delivering the control and stability needed for aggressive street and track use.
Why We Recommend 450 lb/in Front & 450 lb/in Rear for the 2015–2021 STI
The STI is built with performance in mind, but from the factory it’s still tuned with a noticeable understeer bias and softer spring rates to keep the car stable and street-friendly. While that makes it predictable, it can also feel a bit heavy and less responsive when pushed.
Our 450 / 450 spring rate setup is designed to sharpen the chassis while maintaining the confidence and drivability the STI is known for.
By running equal spring rates front and rear, we keep the car balanced and composed through all phases of driving. This helps reduce body roll, improve transitional response, and eliminate the “front-heavy” feeling the STI can have in stock form.
Up front, the 450 lb/in spring improves support under braking and turn-in, reducing dive and giving the steering a more immediate, connected feel. In the rear, matching that rate stabilizes the chassis under acceleration and helps the car stay composed when putting power down through the AWD system.
The result is a setup that:
- Reduces body roll and front-end push
- Improves turn-in and overall responsiveness
- Maintains a stable, confidence-inspiring balance
- Preserves ride quality for daily driving
This pairing works hand-in-hand with our digressive valving, where the shock provides strong low-speed control. That means we don’t need to rely on overly stiff springs to achieve performance, allowing the car to feel controlled without becoming harsh.
Overall, 450 front / 450 rear gives the STI a more planted, responsive feel while keeping it comfortable and predictable enough for everyday use and spirited driving.
