Dežru Spec-RS • Track Focused Audi A4 B6 Coilover System

Built to unlock the precision hidden inside the B6 chassis.

Engineered around the Audi A4 B6 platform, the Spec-RS delivers sharper steering response, improved front-end support, and significantly greater chassis control for aggressive street driving, canyon roads, autocross, and track use.

Digressive monotube dampers Remote reservoir design 20-position rebound adjustment Tuned specifically for B6 dynamics

Dežru Spec-RS Coilovers – Audi A4 B6 (2001-2005)

The Dežru Spec-RS coilover system is engineered specifically for the Audi A4 B6 chassis. Whether equipped with quattro or front-wheel drive, the B6 platform benefits tremendously from improved damping control, proper spring selection, and suspension geometry that works with the chassis rather than against it.

Developed for serious street driving, canyon roads, autocross, and track days, the Spec-RS utilizes digressive piston valving to improve low-speed chassis control during braking, turn-in, and weight transfer while maintaining enough compliance to remain stable and predictable over real-world pavement.

Unlike generic coilovers that rely on excessive spring stiffness to create control, the Spec-RS uses properly matched spring rates and digressive damping to produce a suspension that feels more precise, more responsive, and more confidence inspiring without becoming unnecessarily harsh.

Fixed-length damper bodies paired with a 25–50 mm adjustable lowered ride height help preserve usable suspension stroke and proper suspension geometry. This allows the B6 to maintain grip and composure during aggressive driving rather than sacrificing travel simply to achieve ride height.

Key Features

Digressive monotube dampers for improved transient response, consistent damping behavior, and precise chassis control.
Remote reservoir configuration improves thermal stability during aggressive driving and extended track sessions.
Fixed-length damper bodies with 25–50 mm adjustable lowered ride height to preserve suspension travel and geometry.
20-position rebound adjustment allows fine tuning for daily driving, canyon roads, autocross, and track use.
450 lb/in front and 700 lb/in rear spring rates, selected specifically for the B6 chassis to provide excellent front-end support, predictable balance, and strong rear platform control.
Linear performance springs provide smooth and predictable load transfer throughout suspension travel.
Pillowball upper mounts improve steering precision and alignment consistency under high cornering loads.
Hand-built and dyno-matched dampers ensure precise left-to-right consistency and repeatable performance.

Performance Character

The Spec-RS transforms the Audi A4 B6 into a more disciplined and responsive performance chassis. Steering inputs are met with greater precision, body motion is reduced, and weight transfer becomes more controlled and predictable.

The digressive damping profile delivers strong initial platform control during braking and turn-in while remaining compliant enough to maintain grip and stability over rough pavement and mid-corner imperfections.

Compared to softer street-oriented suspensions, the Spec-RS significantly improves confidence during rapid transitions, high-speed cornering, and aggressive driving while preserving enough compliance for real-world use.

The result is an Audi that feels sharper, flatter, and more connected without sacrificing the refinement expected from the platform.

Why We Recommend 450 lb/in Front & 700 lb/in Rear for the Audi A4 B6

For the Audi A4 B6, a 450 lb/in front and 700 lb/in rear spring package delivers an excellent balance between ride quality, responsiveness, and chassis support.

The 450 lb/in front spring provides the support necessary to reduce excessive dive, improve steering precision, and increase front-end confidence without creating unnecessary harshness.

The 700 lb/in rear spring provides the additional rear platform support necessary to keep the chassis balanced during corner entry, mid-corner loading, and corner exit while complementing the B6's suspension geometry and motion ratios.

This combination was selected to work directly with the Spec-RS digressive valving package rather than relying solely on spring stiffness to generate control. The result is a suspension that maintains grip and communication while providing the sharper response expected from a serious performance setup.

This setup helps the Audi A4 B6:

Improve braking support and steering response
Reduce excess body motion and chassis delay
Improve confidence during rapid transitions
Increase rear stability during acceleration and corner exit
Maintain composure over uneven pavement and curbing
Deliver sharper handling without sacrificing drivability

Overall, the 450/700 combination gives the Audi A4 B6 a significantly more focused and confidence-inspiring character while preserving the balance and refinement that make the platform such a rewarding driver's car.

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.