XYZ Racing Tarmac Rally Coilovers — Honda CIVIC SI φ54 (Modified Rear lntegrated) 2017-2026

Sealed-stage tarmac rally punishes a chassis in a way a track day never does: crested compressions taken flat, mid-corner ruts, and camber changes that arrive with no warning lap to learn them on. The XYZ Racing Tarmac Rally coilover for the Honda Civic Si HN25-10 is built around that reality, with a 54mm shock body sized to control the big single hits a closed-road stage throws up rather than the smooth, repeatable loads of a circuit.

This is a rear-integrated kit, engineered specifically to work with the Civic Si’s modified rear end rather than treating it as an afterthought. On a chassis where the rear geometry has already been reworked, getting the damper mounting right is what separates a coilover that actually controls the axle from one that fights it.

What this coilover does for your 2017-2026 Honda Civic Si

Hit a broken edge or a mid-corner bump at rally pace and the first thing you notice is how little the body kicks back at you. The 54mm damper body gives the Tarmac Rally unit the oil volume and piston area to soak up a hard, single-hit compression without spiking through to the chassis, so the car stays settled rather than skipping sideways off-line. That control matters most exactly where it’s needed: keeping the tyre’s contact patch loaded through a bump instead of letting it unweight and slide. On a Civic Si that’s already had rear-end work done, the rear-integrated mounting means the damper’s control at that end matches what’s happening at the front, rather than one axle working against the other through a rough section. The result on the HN25-10 is a car that holds its line over broken tarmac instead of getting deflected by it, with the stability to carry more speed into the next corner rather than backing off to protect the chassis.

About the Tarmac Rally coilover

XYZ Racing built the Tarmac Rally line specifically around the demands of closed-road stages: surfaces that are sealed but rarely smooth, with the kind of compressions, crests and mid-corner bumps that a pure circuit damper isn’t tuned to absorb. The valving is set up to take a big, sudden hit without transmitting the shock straight into the body shell, so the chassis stays composed instead of getting knocked off its line. That same control keeps the tyre pressed into the road through the bump rather than letting it skip, which is where the traction actually comes from on a broken surface. The damping settings themselves are drawn directly from XYZ’s own Tarmac Rally programme rather than a generic road-going baseline, carried over into a unit built for exactly this kind of stage work. On the Civic Si HN25-10 that translates into a coilover that keeps the car planted and predictable when the road stops being flat, rather than one that’s simply stiff.

Fitment for the Honda Civic SI (2017-2026)

Built for the Honda Civic Si HN25-10 chassis, covering the 2017-2026 model years, with the rear-integrated mounting configuration required for cars running the modified rear setup. Confirm your build matches the HN25-10 designation before ordering, as the rear mounting is specific to this configuration.

What buyers also search for

• Honda Civic Si HN25-10 coilovers for tarmac rally and rough closed-road stages
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• 54mm shock body coilovers for Honda Civic Si rally builds
• Civic Si suspension setup that holds its line over compressions and mid-corner bumps

Spec your HN25-10 Civic Si with the damping XYZ built for its own rally programme – configure yours below.