XYZ Racing Circuit Master Coilovers — Infiniti FX35/37 S51 4WD (Modified Rear Integrated) 2008-2013

The FX35/37 S51 carries its weight high and forward for an SUV-coupe, and that mass transfers hard through the front struts the moment you turn in on a circuit. XYZ Racing’s Circuit Master coilover for the S51’s 4WD chassis is built around that reality: a full range configured for sustained lap-time work, not a single fast lap and a cool-down lap.

On a modified-rear-integrated 4WD platform like this one, rear-end stability under trail braking matters as much as front grip, and the Circuit Master’s damping range is there to let you balance both ends rather than just stiffening the front and hoping.

What this coilover does for your 2008-2013 Infiniti FX35/37

Fitted to the 2008-2013 FX35/37, the Circuit Master brings session-to-session consistency rather than a one-off best lap. The 9720 available damping combinations mean the front and rear can be set independently to match how load moves through this 4WD platform’s modified rear end under braking and corner exit. The monotube-style circuit build resists the heat build-up that softens damping force over back-to-back sessions, so the tenth lap should still feel like the first. Ride height comes down with the coilover sleeves, lowering the FX’s centre of gravity and cutting the body roll that a tall SUV-coupe chassis is otherwise prone to through direction changes. With three external adjustment knobs, you can retune compression and rebound between sessions without pulling the dampers apart.

About the Circuit Master coilover

The Circuit Master is XYZ Racing’s dedicated circuit-track damper, developed and run by XYZ’s own racing teams on international circuits rather than built as a general road-and-track compromise. Its headline figure is 9720 possible adjustment combinations across the three external knobs, giving a genuinely fine-grained window into compression and rebound rather than a handful of coarse steps. The small-orifice valving inside each knob is what delivers that resolution – XYZ notes that running the small passages over sharp kerbs or big bumps can produce a faint noise from oil moving through them, which is a normal side effect of the design rather than a fault, and irrelevant on the smooth, prepared surfaces this damper is built for. Everything about the construction – from the oil circuit to the knob placement – is aimed at circuits, not broken B-roads, so don’t expect the plush low-speed compliance of a fast-road-biased XYZ range.

Fitment for the Infiniti FX35/37 (2008-2013)

This kit is built for the Infiniti FX35/37 S51 chassis in 4WD, modified-rear-integrated configuration, covering the 2008 to 2013 model years. Confirm your FX35 or FX37 sits within the S51 generation and the 4WD drivetrain before ordering, as coilover geometry is specific to this chassis code.

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Configure your Circuit Master spec for the FX35/37 S51 below to match front and rear damping to how you’ll actually use the car.