XYZ Racing Circuit Master Coilovers — Infiniti M35 / M45 Y50 FUGA 2WD (Modified Rear Integrated) 2004-2009

A near-1.8-tonne VQ35 saloon built for effortless motorway cruising was never going to arrive at a circuit with a rear axle ready for repeat lap sessions, and that is the gap Circuit Master closes on the Y50-generation Infiniti M35 and M45. The factory multi-link rear was tuned around comfort-biased bushing and soft spring rates that let the tail wallow under trail-braking and mid-corner load transfer – fine on a motorway sweeper, a liability once you are chasing a consistent lap.

Circuit Master is XYZ Racing’s dedicated circuit-focused platform, built for exactly this scenario: a heavy rear-drive saloon that needs its chassis tightened without the ride turning into a chore on the road back from the track. For the Fuga and M-series specifically, that means a rear kit engineered around this car’s modified rear-integrated suspension mounting rather than a generic strut conversion bolted on and hoped for.

What this coilover does for your 2004-2009 Infiniti M35 / M45 Y50 FUGA 2WD (Modified Rr Integrated)

Circuit Master’s three adjustment knobs cover compression and rebound across 9720 possible combinations, which is enough range to firm the rear for hard trail-braking into hairpins without also stiffening the front to the point where the VQ35’s nose starts pushing wide on entry. That matters on a nose-heavy, rear-driven saloon: you want enough front support to resist dive under braking and enough rear compliance to keep the inside wheel loaded through a fast direction change. Ride height is adjustable independently of the damping settings, so you can correct the M35/M45’s factory corner weights and pull the centre of gravity down before you start dialling in bump and rebound. Fitted through the modified rear-integrated mounting points, the kit keeps the Y50’s rear geometry intact instead of forcing a compromise to make an off-the-shelf strut fit.

About the Circuit Master coilover

Circuit Master sits at the top of XYZ Racing’s competition range, alongside the brand’s Racing Spec, Drift Spec and Tarmac Rally lines, and it is the version XYZ points squarely at circuit lap-time work rather than drift or rally use. It has been run and validated by XYZ’s own racing teams competing internationally, with development feedback folded back into the valving rather than left as a one-off spec sheet. The headline number is the 9720-way adjustment range delivered through the three external knobs, giving enough granularity to move from a soft trailer-queen setting to a stiff qualifying setup without swapping hardware. The valving uses a small-oil-hole passage design; on sharp bumps or kerbs this can produce a faint noise from oil moving through the restricted channel, which is a normal characteristic of this circuit-tuned valving rather than a fault, and it is not something you will notice as an issue on a smooth circuit surface. The whole unit is built around sustained lap-after-lap use rather than a single fast run, which is the brief for anyone taking a 2WD Y50 saloon like the M35 or M45 onto a track.

Fitment for the Infiniti M35 / M45 Y50 FUGA 2WD (2004-2009)

This kit is built for the Y50-chassis Infiniti M35 and M45 (JDM-badged Nissan Fuga), chassis code IN08, across the 2004 to 2009 production run, on 2WD cars with the modified rear-integrated suspension mounting. Confirm your car uses this rear-integrated mounting configuration before ordering, since Y50 variants were built across multiple markets with differing rear hardware.

What buyers also search for

• Infiniti M35 M45 track suspension upgrade with adjustable damping
• Y50 Fuga coilover setup for repeat circuit sessions rather than a single fast lap
• Infiniti M-series ride height and corner weight adjustment for track use
• Circuit Master damping range for a heavy rear-drive saloon
• IN08 chassis coilover fitment for modified rear-integrated Y50 cars

This is the rear-drive saloon platform built for circuit work, not a compromise borrowed from a road kit – configure your Circuit Master spec below.