XYZ Racing Top Sport Coilovers — Infiniti Q45 (Y33) welding 1997-2001

The Y33 Q45’s factory suspension was tuned for boulevard comfort, not body control – a heavy, front-mounted VH45DE V8 loading the nose hard under trail-braking while soft factory springs let the tail float through direction changes. XYZ Racing’s Top Sport coilover kit for this Infiniti chassis lifts damping by 30-50% over the street baseline (or roughly 2kg/mm on spring rate), giving a two-tonne-class luxury saloon the body control it never had from the factory.

This is the welded top-mount version of the kit, specified for the Y33’s strut towers where a bolt-in top hat isn’t the fitment. Top Sport is XYZ’s occasional-track-day spec – stiffer than a fast-road setup but still liveable on the school run, aimed at Q45 owners who book the odd track day and drive the car home afterwards.

What this coilover does for your 1997-2001 Infiniti Q45

Increase the damping force over standard by 30-50% (or step the spring rate up by around 2kg/mm) and the Q45’s nose stops diving into corners the way it does on the factory dampers. Bigger hits – speed bumps, potholes, motorway expansion joints – get absorbed rather than transmitted straight into the shock body, so the chassis stays settled instead of skipping. That control translates directly into tyre contact: less unloading over mid-corner bumps means more of each tyre’s contact patch stays on the road under power and under braking. On a car this heavy, that stability is what turns a wallowy saloon into something you can place accurately on a B-road or a track’s entry kerb.

About the Top Sport coilover

Top Sport sits in XYZ Racing’s range as the step up from a fast-road setup, built around the same racing-derived damper and spring philosophy the brand runs in its own Top Sport competition programme. Damping is raised 30-50% over street settings, with spring rates lifted by roughly 2kg/mm, so the kit deals with big compressions – kerb strikes, mid-corner ruts, heavy braking bumps – without the shock body bottoming out or the chassis losing composure. The aim, carried over from XYZ’s track experience, is a setup that stays composed and predictable through repeated hard direction changes rather than one that’s only stiff in a straight line. It’s positioned for owners who want a car that can be driven hard – aggressive road driving, the odd track day – without turning the daily commute into a chore.

Fitment for the Infiniti Q45 (1997-2001)

Built for the Y33-generation Infiniti Q45, covering the full 1997 to 2001 production run. This listing is the welded top-mount configuration – confirm your car’s top-mount type before ordering, as XYZ also lists a bolt-in version for other Q45 applications.

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Spec is fixed per axle for this Top Sport kit – pick your Q45 (Y33) welded-mount option and configure yours below.