Fortune Auto 510 Coilover Kit | 17-20 Honda Civic Si

Fits:

• 2017 - 2020 Honda Civic Si

Hand-assembled in the USA — allow 4-8 weeks lead time. Cancellations are subject to a 30% restocking fee per Fortune Auto's dealer guidelines. This listing is a divorced-rear (OE-style) setup with standard spring rates; for a True-Rear setup or custom spring rates, contact us for a quote. Default spring rates are recommended unless you already have experience choosing custom rates.

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The 510 Series sits above the 500 in Fortune Auto's lineup, built around their Concave Flow Digressive (CFD) piston for a genuinely wider adjustment range than a conventional damper can offer. Where a typical shock can handle roughly a 2kg spring rate difference before needing a revalve, the CFD piston covers a full 8kg range — meaning you can tune your setup at the track on race day without ever pulling the damper apart.

That range gives the 510 a real Jekyll-and-Hyde character: dial it one way and a lower spring rate firms up using the damping range as an artificial spring rate; dial it the other way and a higher spring rate feels noticeably smoother. The result is a coilover that's comfortable enough for the street and unyielding enough for the track, adjustable with a single knob rather than a trip to the shop.

Every damper ships custom-built with its own assembly certificate and dyno graph, backed by a 5-year limited warranty, with 24-step simultaneous rebound and compression adjustment. T6 6061 aluminum mounts and camber plates keep the assembly lightweight and precise, and everything is rebuildable and revalveable at Fortune Auto's Richmond, VA facility if you ever do need to go beyond the built-in range.

Features

• Concave Flow Digressive Piston — 8kg spring rate adjustment range without revalving
• 24-step simultaneous rebound and compression adjustment
• Monotube damper with high-pressure nitrogen charge
• Custom built — individual assembly certificate and dyno graph included
• T6 6061 aluminum mounts and camber plates
• 5-year limited manufacturer's warranty, rebuildable/revalveable, upgradeable to 2-way or 3-way canister
• Optional Swift or Hyperco springs available