XYZ Racing Circuit Master Coilovers — Infiniti G37 COUPE CONVERTIBLE USA (Modified Rear Integrated) 2009-2013

The G37’s naturally aspirated VQ37VHR sits well forward of the front axle, loading the nose hard under trail-braking into slower corners, while the multi-link rear geometry on this Modified Rr Integrated fitment governs how much the rear end squats and rotates once the throttle comes back off. The XYZ Racing Circuit Master coilover is set up around that specific weight transfer, giving the front strut enough support to resist dive without turning the rear into something you have to chase.

This is the range XYZ Racing builds for sustained circuit lap-time work rather than a single fast-road blast, so the spring rates and valving on offer sit stiffer than anything in the Super Sport line and hold their character as track temperatures climb through a session.

What this coilover does for your 2009-2013 Infiniti G37 Coupe Convertible USA (Modified Rr Integrated)

The immediate change is how flat the G37 sits through direction changes: the front struts control the nose-dive that trail-braking exposes on the standard dampers, so turn-in stays sharp deeper into the corner. With three external adjustment knobs producing 9,720 possible damping combinations, you can separate low-speed compression from rebound and find a setting that keeps the rear multi-link planted through the transition from throttle-off to throttle-on, rather than letting the G37’s rear-biased weight distribution catch you out mid-corner. Ride height drops as part of the same install, lowering the centre of gravity and sharpening the response that the standard ride height tends to mask. Because the valving is set up for repeated heat cycles rather than one spirited drive, damping response doesn’t fall away as oil temperature climbs across a twenty-minute session.

About the Circuit Master coilover

Circuit Master sits at the top of the XYZ Racing coilover range, developed alongside the teams XYZ Racing supports on circuits worldwide and tuned specifically for competition use rather than everyday ride comfort. The damper body uses a small-orifice oil-passage design inside the three adjustment knobs, which is what allows such a wide spread of settings – 9,720 combinations in total – though it also means you may hear a faint noise from oil moving through those passages over sharp bumps or kerbing. That’s a normal characteristic of this valving, not a fault, and it’s the trade-off made to get this level of adjustment range into a coilover aimed squarely at track use. Fast-road comfort was never the design brief here; holding a consistent, repeatable damping response across a full circuit session was.

Fitment for the Infiniti G37 Coupe Convertible USA (Modified Rr Integrated) (2009-2013)

This kit is specced for the Infiniti G37 Coupe Convertible USA, chassis code IN07-1, across the 2009 to 2013 model years, and is built around the Modified Rr Integrated rear suspension configuration rather than a standard rear link setup. Confirm your car matches this rear-end specification before ordering, since G37 production spanned more than one rear suspension arrangement across the range.

What buyers also search for

• Infiniti G37 Coupe Convertible coilover upgrade for circuit and track day use.
• Infiniti G37 Circuit Master damping that holds consistent through a full track session.
• Adjustable coilovers for the Infiniti G37 Modified Rr Integrated rear suspension.
• Infiniti G37 IN07-1 track coilover kit for the 2009-2013 model years.

Circuit Master is set up in a specific spring rate and adjustment range for the G37’s IN07-1 rear-end configuration – pick your spec below to match how you’ll actually be using the car.