Fortune Auto 510 Coilover Kit | 22+ Civic Si, 23+ Integra

Fits:

• 2022+ Honda Civic Si
• 2023+ Acura Integra Base, A-Spec

Note: 510 Series Coilovers are custom hand-built to order — most applications carry a 4-7 week lead time (certain applications and peak season orders may vary). Cancellations are subject to a 30% restocking fee per Fortune Auto's dealer guidelines. Default spring rates are recommended unless you're experienced choosing custom rates; dial down slightly if buying for street use only. This listing is for a Divorced-Rear (OE style) setup with standard spring rates — contact us for a True-Rear setup or custom spring rate quote.

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The Fortune Auto 510 Series is a step up in sophistication, built around a Concave Flow Digressive (CFD) piston that delivers an unusually wide adjustment range. Where a conventional shock can only handle about a 2kg spring rate difference before needing a revalve, the CFD piston covers a range of roughly 8kg — letting you dial in your suspension trackside without ever pulling the dampers apart.

That range gives the 510 a genuine dual personality: lower spring rates can be firmed up using the damping range like an artificial spring rate, while higher spring rates ride noticeably smoother than you'd expect. The net result is a coilover that's comfortable on the street and unyielding on track, all from a single adjustment knob.

Choose default steel springs, or step up to Swift or Hyperco. Both use proprietary coiling to weigh less and react faster than a standard spring at the same rate, with more compliance over impacts and weight transfers. Fortune Auto generally recommends Swift for its reliability track record, while Hyperco brings US manufacturing and F1-derived pedigree.

Features

• Amsoil Synthetic Shock Oil
• Concave Flow Digressive Piston Technology™
• Custom built — assembly certificate and dyno graph supplied with shocks
• 5-Year Limited Manufacturer's Warranty
• 24-step simultaneous rebound and compression adjustable dampers
• Monotube damper with high-pressure nitrogen
• T6 6061 aluminum mounts and camber plates
• Rebuildable and revalveable at Fortune Auto's Richmond, VA facility
• Modular — upgradeable to 2-way or 3-way canister