XYZ Racing Circuit Master Coilovers — Infiniti M35 / M45 Y50 FUGA 4WD (Modified Rear Integrated) 2006-2010

The Y50 FUGA’s 4WD layout puts more hardware and more weight through the rear subframe than the rear-drive M35/M45 sold alongside it, and that changes what the rear end needs from a damper. Front-engined, all-wheel-drive luxury saloons like this one carry a nose-heavy stance into corners even with drive going rearward, so the rear axle has to work harder to keep the car settled under trail-braking and mid-corner load changes. The Circuit Master kit is built for exactly that job: sustained circuit lap-time work where the suspension is loaded hard, repeatedly, for twenty-plus minutes at a time.

On a 4WD FUGA with the modified rear integrated into the kit’s design, that means a rear end that stays composed under the drivetrain’s extra mass rather than wallowing or stepping out unpredictably, and a front end that resists the push this platform is prone to when you get back on the throttle early out of a corner.

What this coilover does for your 2006-2010 Infiniti M35 / M45 Y50 FUGA 4WD (Modified Rr Integrated)

With 9720 damping combinations available across the kit’s three external adjustment knobs, you can set the rear noticeably firmer to control the added 4WD mass under load transfer, then back the front off enough to keep the steering communicative rather than nervous over kerbs and mid-corner bumps. That range matters on a car this heavy: too soft and the M35/M45’s mass overwhelms the damper on corner entry, too firm and you lose the mechanical grip the AWD system is meant to be putting down. Monotube construction keeps oil temperatures more stable than a twin-tube design across repeated laps, so the damping curve you set on an out-lap is closer to what you get on lap ten. Because the rear geometry on this fitment is the modified, rear-integrated setup rather than a stock bolt-in, the kit is specifically valved and mounted to work with that hardware instead of fighting it.

About the Circuit Master coilover

Circuit Master sits at the top of the range as XYZ Racing’s circuit-focused platform, developed and run by XYZ-affiliated racing teams on international circuits rather than built to a generic road-going brief. The headline figure is 9720 possible adjustment combinations, delivered through three external knobs rather than a single all-in-one dial, so compression and rebound can be tuned independently front and rear instead of moving together. The small-orifice valving inside those knobs is deliberately tight tolerance for track-precise damping control; XYZ notes that this can produce a faint noise over sharp bumps or expansion joints as oil passes through the narrow passage, which is a normal characteristic of the design rather than a fault, and it is not something you will notice as an issue once you are running on smooth circuit tarmac rather than broken road surfaces. It is the type built for teams chasing consistent lap times rather than daily ride comfort.

Fitment for the Infiniti M35 / M45 Y50 FUGA 4WD (Modified Rr Integrated) (2006-2010)

This kit is built specifically for the Y50-chassis Infiniti M35 and M45 (sold domestically as the Nissan Fuga), covering the 2006 to 2010 model years in 4WD form with the modified, rear-integrated rear end. Chassis code IN09 confirms the fitment against XYZ’s own reference, so check your build plate or documentation against that code before ordering if you’re unsure which Y50 variant you have.

What buyers also search for

• Infiniti M35 M45 Y50 Fuga 4WD coilover kit for circuit and fast-road use
• Infiniti M45 Y50 adjustable damping for repeat track sessions rather than a single hot lap
• Y50 Fuga 4WD rear-integrated suspension upgrade with independent front and rear adjustment
• Infiniti M35 IN09 chassis coilover kit with monotube damper construction
• XYZ Racing Circuit Master coilovers for AWD Y50-platform saloons

Configure your Circuit Master spec for the Y50 M35/M45 below to match the damping range to how you’ll actually use the car.