XYZ Racing Circuit Master Coilovers — Infiniti Q45 (F50) CIMA welding 2001-2008

The F50-generation Q45 was built as a flagship luxury saloon, not a corner-carver – a heavy body on factory dampers tuned for boulevard compliance, with a nose that wants to run wide the moment cornering loads build. Circuit Master coilovers exist to undo that brief. Where the standard setup absorbs energy, this kit controls it, giving the F50 a platform stiff enough to hold a line through a fast sweeper without the body roll the factory geometry was designed around.

For an owner taking this saloon onto a circuit for repeated sessions rather than the odd track day, that distinction matters. Heat cycling, consistent damping across a stint, and a chassis that doesn’t lean further with every lap – that’s the job description here, and it’s why this coilover exists as a separate tier from a fast-road setup.

What this coilover does for your 2001-2008 Infiniti Q45 (f50) CIMA Welding

Fitted to the Q45, the Circuit Master’s adjustment range lets you work independently on compression and rebound rather than compromising both with a single dial – useful on a car this heavy, where too little rebound control lets the body float after a direction change and too much locks the wheel down over kerbs. You get a platform that turns in with more authority than the factory setup allows, holds camber and contact patch through sustained cornering, and stays consistent lap after lap of hard use rather than softening as the dampers heat up. The construction is built around circuit use specifically: this isn’t a comfort-first spring rate with a damper bolted on, it’s a system where the spring, the damper and the adjustment range were chosen for lap-time consistency on a car that was never originally built to deliver it.

About the Circuit Master coilover

Circuit Master sits at the top of the XYZ Racing range, developed alongside the brand’s Racing Spec, Drift Spec and Tarmac Rally variants but tuned specifically for sustained circuit running rather than a single discipline like drift angle or rally surface changes. The damper carries three external adjustment knobs feeding a total of 9,720 damping combinations, giving a genuinely fine-grained way to match the setup to a specific track, tyre or driving style rather than picking from a handful of preset stages. XYZ’s racing teams have run this damper internationally, and the small-oil-hole metering inside the knobs that makes that adjustment range possible can produce a faint noise over sharp bumps – a known characteristic of the design, not a fault, and one that’s irrelevant on the smooth surfaces this coilover is built to run on. Everything about the construction, from the monotube body to the knob placement, is aimed at one thing: letting a driver dial in a setup and trust it to hold across an entire session.

Fitment for the Infiniti Q45 (f50) CIMA Welding (2001-2008)

This kit is engineered specifically for the F50-chassis Q45, covering the 2001 to 2008 model years sold under the Q45 and CIMA Welding naming. Confirm your car sits within this chassis code and year span before ordering, as coilover geometry is matched to the F50’s specific hardpoints and will not carry over to earlier or later Q45 generations.

What buyers also search for

• Infiniti Q45 F50 suspension upgrade for circuit and track day use
• Infiniti Q45 Circuit Master damping that holds consistency across repeat sessions
• Infiniti Q45 (F50) CIMA Welding coilover options for a heavier RWD platform
• Adjustable coilovers for Infiniti Q45 2001-2008 track builds

Spec your F50 Q45 exactly as it will run – configure yours below.