Dežru Spec-A • Comfort Street 15–21 Subaru STI Coilover System

A more refined STI without losing what makes it an STI.

The Spec-A is built for drivers who want a lowered, controlled STI that doesn’t feel harsh or tiring in daily driving. It improves composure while maintaining the precision and confidence the chassis is known for.

Comfort-focused valving Rebuildable monotube shocks Balanced street spring rates

Dežru Spec-A Coilovers – Subaru STI (2015–2021)

The Dežru Spec-A is engineered specifically for the VA STI, delivering a more comfortable and usable version of the platform without dulling its performance character.

Many coilover setups for the STI prioritize stiffness, which often results in a harsh, overly busy ride on real-world roads. The Spec-A takes a more balanced approach, using properly matched spring rates and damping to maintain control while significantly improving ride quality.

With a lowering range of 0.5" to 3" below OEM ride height, the Spec-A provides the aggressive stance most STI owners want while maintaining proper suspension function and drivability.

Key Features

Comfort-focused monotube dampers tuned for real-world driving conditions.
Rebound adjustable (20 clicks) for dialing in ride quality and responsiveness.
~392 lb/in front and ~448 lb/in rear spring rates, selected to support the STI chassis while maintaining comfort.
Dual height adjustment for independent ride height and preload tuning.
Radial bearing front mounts for smooth steering operation.
OEM hybrid upper mounts to reduce noise and vibration.
CNC machined high-flow piston for consistent damping performance.
Electro-plated steel shock bodies for durability.
Stainless steel shim stacks for long-term reliability.
Pre-configured brackets for ABS and sensor integration.
Fully rebuildable with individual parts available.

Performance Character

The Spec-A refines the STI’s driving experience by reducing harshness and unnecessary stiffness while maintaining strong chassis control. The car feels more composed over rough roads and less fatiguing during daily use, without becoming soft or disconnected.

The front spring rate provides the support needed for confident turn-in and braking, while the slightly higher rear rate helps stabilize the chassis during acceleration and cornering. This results in a balanced, predictable feel that works well in both daily driving and spirited conditions.

Around town, the ride is smoother and more forgiving. On the highway, the car feels planted and stable. When pushed on backroads, it maintains composure without the harshness typically associated with stiff coilovers.

While designed primarily for comfort, the Spec-A is still capable of spirited driving and occasional autocross, making it a versatile setup for street-focused STI builds.

Who This Is For

Drivers who want a more comfortable, daily-drivable STI
Those tired of overly stiff, harsh coilovers
Street-focused builds with occasional spirited driving
Owners who want control without sacrificing ride quality

If your goal is an STI that still feels sharp but no longer punishes you on imperfect roads, the Spec-A strikes that balance.

Dežru Performance Suspension warrants to the original purchaser that these parts manufactured and/or sold by Dežru Performance Suspension (the product) is free from defects in material and workmanship under normal use. Dežru Performance Suspension warrants that the product will perform substantially in accordance with the specifications set forth in the documentation provided with it. The above express warranties are made for a period of the lesser of 12,000 miles or 36 months from the date the product is installed in your vehicle. Any improper use, operation beyond capacity, substitution or addition of parts not approved by Dežru Suspension in writing, any alteration or repair by others, or any removal, defacing or altering of the identification shall void this warranty. There is no warranty on high-performance or race related parts due to the nature of usage.