XYZ Racing Circuit Master Coilovers — Infiniti Q45 (Y33) welding 1997-2001

The Y33-generation Q45 carries a lot of car over its front axle – a V8 slung ahead of the firewall in a body that tips the scales well past 1,700kg – and that mass doesn’t disappear just because you’ve found a corner. XYZ Racing’s Circuit Master coilover is built for owners who want to load that chassis hard and repeatedly without the standard air-assisted suspension sagging into vague, wallowy responses lap after two.

This isn’t a ride-height kit bolted on for show. The Circuit Master is XYZ’s dedicated sustained-lap-time platform, aimed at Q45 owners running track days or club circuit events who need the front end to stay planted through a session, not just through one hot lap.

What this coilover does for your 1997-2001 Infiniti Q45

Swapping out the factory setup addresses the two things that hurt a big RWD luxury saloon on track: body roll under the V8’s weight and inconsistent damping once the suspension heats up. The Circuit Master’s damping range lets you firm up compression and rebound enough to control that nose-heavy weight transfer under braking into slower corners, where the standard Q45 suspension tends to dive and unsettle the rear. Ride height adjustment brings the centre of gravity down and tightens the car’s roll axis, which matters on a chassis this long and heavy through direction changes. Because the damper is tuned around repeat-lap use rather than a single fast run, the behaviour you get on your out-lap should still be there ten laps later.

About the Circuit Master coilover

XYZ builds the Circuit Master as its top-tier circuit-focused damper, developed and run by XYZ’s own racing teams across multiple international circuits rather than designed on a bench and left there. The headline figure is 9,720 individual damping combinations, delivered through three separate adjustment knobs so compression, rebound and low-speed circuits can be tuned independently instead of moving as one blunt setting. That fine-grained control is aimed at drivers chasing a specific balance for a specific corner, not a generic "stiffer is better" setup. The compact oil-passage design that enables this level of adjustment can produce a faint noise over sharp bumps and kerbs – a byproduct of the small-bore construction, not a fault, and it’s not something you’ll notice mid-corner on a circuit surface, which is the environment this damper is built for.

Fitment for the Infiniti Q45 (Y33) Welding (1997-2001)

Confirmed for the Y33-chassis Infiniti Q45 across the full 1997-2001 production run. This is a welding-fit rear application, meaning the rear mounts are fitted by welding rather than a direct bolt-in swap – factor that into your fitting time and choice of installer before ordering.

What buyers also search for

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Configure your damping and ride height for the Y33 Q45 below to get the exact Circuit Master spec for your car.