Ksport CMZ321-C3 Circuit Pro Adjustable Coilover Kit with External Reservoirs - 3-Way

The Ksport CMZ321-C3 Circuit Pro 3-Way Coilover Kit is Ksport's top-of-the-line suspension system, engineered for enthusiasts and motorsports professionals who demand maximum performance, adjustability, and durability. Validated across virtually every competitive motorsports discipline — from drifting and time attack to circuit and endurance racing — the Circuit Pro system is equally capable as a daily driver or a dedicated track weapon.

External Reservoirs with 3-Way Independent Adjustment:

The defining feature of the Circuit Pro system is its external remote reservoirs, which enable fully independent adjustment of rebound damping, compression damping, and nitrogen gas pressure. This three-axis control yields 11,664 possible tuning combinations, giving drivers unparalleled ability to dial in suspension behavior for any surface or driving style. The added oil and gas capacity provided by the reservoirs also significantly improves thermal management, maintaining consistent damping performance throughout extended heat cycles such as endurance racing or tarmac events.

Key Features:

• 55mm Monotube shock design — oil and gas are separated within the cylinder for faster, more even heat dissipation and finer damping adjustments versus twin-tube construction
• 11,664 possible settings via independent rebound, compression, and nitrogen pressure adjustment
• External reservoirs provide increased shock oil and nitrogen gas capacity, reducing operating temperatures during extended track use
• Individual dyno testing — each unit is dyno tested at the factory; results are available upon request at time of purchase to assist with tuning
• Adjustable lower mount allows ride height adjustment without compromising shock or spring travel
• 6061-T6 billet aluminum construction for mounts, collars, and spring perches — lightweight, strong, and corrosion-resistant
• Zinc electroplated steel shock bodies for protection against rust and the elements; anti-rust paste packet included
• Upgraded bump stops included to prevent shock bottom-out over rough or uneven road surfaces
• Aggressive spring rates and 20–30mm shorter shock stroke optimized for track performance
• Upper mount options include rubber, pillowball, or Ksport's advanced camber/caster-adjustable pillowball mounts (application dependent)
• 12-month warranty covering manufacturer defects

Each Circuit Pro kit ships ready to install with external reservoirs as standard equipment. Note: certain applications may include front reservoirs only if rear packaging space is insufficient. The CMZ321-C3 delivers a professional-grade suspension platform that eliminates compromise between track performance and street usability.