Dežru Spec-S • Street & Touring 02-05 Honda Civic Si Coilover System

Balanced daily comfort with real back-road capability.

Designed to lower your car by approximately 25–30 mm while maintaining composure over real-world roads, the Spec-S sharpens turn-in and body control without beating you up on the commute.

Inverted monotube shocks Nickel-plated shock bodies Vehicle Specific Spring Rates

Dežru Spec-S Coilovers – 2002–2006 Honda Civic Si (EP3)

The Dežru Spec-S coilover system is engineered specifically for the 2002–2006 Honda Civic Si (EP3), a lightweight, front-heavy FWD chassis that responds exceptionally well to properly matched spring rates and modern damper tuning. Designed around the EP3’s suspension geometry, weight distribution, and intended dual-purpose use, the Spec-S delivers sharper turn-in, improved front-end support, and predictable rotation without sacrificing daily drivability.

Developed for drivers who daily their Civic Si but still enjoy spirited street driving, autocross, and occasional HPDE track days, the Spec-S features digressive piston valving that provides strong low-speed support during braking, corner entry, and transitions, while remaining compliant over bumps and rough pavement. Rather than relying on excessive stiffness, this setup targets a balanced ride frequency in the ~2.0–2.3 Hz range, tightening the chassis and improving feedback while keeping the car comfortable and confidence-inspiring.

Fixed-length damper bodies paired with a 25–35 mm adjustable lowered ride height preserve proper suspension stroke and geometry. This maintains usable bump travel and predictable roll behavior, allowing the EP3 to remain stable under hard braking and responsive during rapid direction changes.

Key Features

Digressive monotube dampers for controlled body motion, consistent damping performance, and clear steering feedback.
Fixed-length damper bodies with 25–35 mm adjustable lowered ride height to preserve geometry and usable suspension travel.
Adjustable damping to fine-tune rebound for daily driving, autocross, or track use.
450 lb/in front and 400 lb/in rear spring rates, selected to support the front-heavy FWD layout while allowing controlled rear rotation.
Linear HyperCoil springs for predictable load transfer and smooth, consistent response throughout suspension travel.
OEM-style upper mounts to minimize NVH while maintaining proper fitment and alignment consistency.
Hand-built, dyno-matched pairs to ensure precise left-to-right damping consistency.

Performance Character

The Spec-S transforms the Civic Si EP3 by improving front-end bite, reducing brake dive, and tightening transitional response without making the car harsh or nervous. The digressive damping profile provides immediate support during initial inputs, paired with controlled compliance that keeps the tires planted as grip builds.

The result is a responsive, predictable, and confidence-inspiring Civic Si that remains comfortable for daily use, yet sharp and composed when driven aggressively.

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.