Koni Shock | Rear Left Special Active Red • R55/R56/R57/R58/R59

The KONI Special Active Shock (formerly known as FSD) is KONI’s most advanced offering for drivers who want to improve ride quality and handling — without sacrificing either. Designed for modern performance and luxury vehicles, these shocks automatically adapt to changing road conditions and driving styles using KONI’s patented Frequency Selective Damping (FSD) technology.

Unlike traditional adjustable shocks, there’s no need to turn knobs or mess with tools — the damper intelligently and instantly reacts to road inputs, delivering a supple ride over rough pavement and tighter control when the road gets twisty.

Whether you’re daily driving, road-tripping, or hitting canyon roads on the weekend, KONI Special Active delivers a refined, dynamic driving experience without compromise.

FEATURES

Frequency Selective Damping (FSD) Technology

Automatically adjusts damping forces in real time based on road input frequency. Low-frequency motions (like body roll and pitch) are damped more aggressively, while high-frequency vibrations (like expansion joints and rough pavement) are absorbed for comfort.

Perfect Blend of Ride and Handling

Unlike traditional performance shocks that trade comfort for control, Special Active gives you both. Ideal for drivers who want more composure without harshness.

No External Adjustment Needed

Set-it-and-forget-it. FSD takes care of the tuning automatically, adapting to the road and your driving behavior without knobs, dials, or guesswork.

Optimized for Stock or Mildly Lowered Springs

Designed to work great with OEM suspension setups or moderate lowering springs, keeping suspension geometry and travel within ideal ranges.

Gas-Charged Twin-Tube Design

Provides consistent damping performance with excellent heat dissipation and ride quality over time.

OEM-Grade Durability

Built to strict tolerances with high-quality materials for long-lasting performance. Backed by KONI’s reputation and warranty support.

Improves Vehicle Dynamics Across the Board

Reduces brake dive, body roll, and pitch under acceleration without increasing ride harshness — great for vehicles with soft factory damping.

NOTES

• Technology proven on over 1.5 million factory equipped vehicles
• Secure and stable feeling for spirited driving
• Unrivaled aftermarket solution can be fitted to most new and older cars
• Driving refinement for cars, light trucks, SUVs, etc.
• Technology that rivals expensive electronic systems
• Performance for driver and comfort for passengers in one
• Improves safety and road holding
• Lifetime Warranty

This part also goes by the following cross reference.

Cross Reference Part Number:

Fitment data is currently being updated for this part. Please contact us with your VIN to confirm compatibility.