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

The S51-generation FX35/37 is a genuinely heavy 4WD crossover-coupe, and that mass sits high, which means body roll and rear squat show up quickly the moment you push past normal road speeds. XYZ Racing’s Top Sport coilover for this chassis is built around that problem, with a Modified Rr Integrated rear end that ties directly into the FX’s multi-link layout rather than fighting it.

This is a coilover kit for owners who want the FX35 or FX37 sharper for the odd track day without turning it into a car that beats you up on the school run. It sits in XYZ Racing’s range as the step for drivers who want measurable gains in body control and still want to drive the car every day.

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

On a 4WD SUV-coupe this size, the first thing you notice is how much less the nose dives under braking and how much less the rear end squats away from you out of a slow corner. The kit’s damping is set 30-50% firmer than a street base rate, so mid-corner body movement settles faster and the FX stops wallowing when you load the outside tyre through a fast sweeper. The higher spring rate – roughly 2kg/mm over standard – keeps the contact patch working during heavier direction changes, which on a car this weight is where you actually gain grip, not lose it. Ride height is adjustable through the coilover body, so you can bring the centre of gravity down without resorting to a fixed drop that ruins the car on a poor road surface. The net result on the FX35/37 is a chassis that stays flatter under load and puts power down more cleanly out of the corner, which matters given how much weight the 4WD driveline is already asking the rear axle to manage.

About the Top Sport coilover

The Top Sport sits in XYZ Racing’s line-up as the setup built from their own track-day testing, tuned specifically to control big hits rather than just stiffen the ride. Damping is increased 30-50% over a street-spec valve, paired with roughly 2kg/mm more spring rate, so the kit absorbs the shock of rough tarmac and larger bumps without transmitting that impact straight into the body. That combination is aimed at suppressing shock-body movement under load, which keeps the tyre’s contact patch consistent and improves traction rather than just firming up the ride for its own sake. It is a full coilover assembly with height adjustment built in, sized for aggressive road driving and repeated track sessions rather than a single trackday and back to stock.

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

This kit is built for the S51-chassis Infiniti FX35 and FX37, 4WD, model years 2008 to 2013, and is specified for the Modified Rr Integrated rear configuration (chassis code IN01). Confirm your FX is the 4WD variant within this year range before ordering, as the rear integration is specific to this drivetrain layout.

What buyers also search for

• Infiniti FX35 FX37 coilover upgrade for road and track use
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• Infiniti FX37 Top Sport coilover damping for repeat track sessions
• S51 FX chassis body-control upgrade for aggressive driving

Spec your FX35 or FX37 exactly the way this chassis needs it – configure yours below.