XYZ Racing Circuit Master Coilovers — Maserati Quattroporte M139 (Cancellation Kit for Electronic Damping) 2003-2012

The M139 Quattroporte was conceived as a four-door GT with Skyhook electronic damping doing the heavy lifting between Ferrari-derived V8 noise and saloon-car civility. Twenty years on, those Skyhook struts are the single most expensive thing a 4200-era owner can be quoted for, and the OE replacement pricing has pushed plenty of these cars off the road entirely. The XYZ Racing Circuit Master coilover with cancellation kit is the route back.

This is a full mechanical conversion – not a workaround, not a resistor in a loom. The kit replaces the entire electronically-controlled damper assembly with a properly engineered, manually adjustable coilover, and the included cancellation hardware tells the M139’s ECU to stop hunting for a strut it can no longer see.

What this coilover does for your 2003-2012 Maserati Quattroporte M139 (Cancellation Kit for Electronic Damping)

The M139 is a long, heavy car with a front-mid V8 and a transaxle at the back, and on tired Skyhook units it floats over crests and rolls more than it should into a fast bend. The Circuit Master pulls the body down onto its springs, settles the front end, and gives the chassis the secondary ride control its weight needs at motorway speed. With manual damping adjustment you can take the cabin from town-friendly to firm enough for a back-road blast in a few clicks per corner. The cancellation kit shuts the Skyhook warning out of the dash, so the car drives like the GT it was, without the binnacle nagging.

About the Circuit Master coilover

Circuit Master sits at the road-and-occasional-track end of the XYZ Racing range, built around a 30-way damper with combined bump and rebound on a single knob. The body is a CNC-machined steel housing with a separately adjustable lower mount, which means ride height and spring preload are decoupled – you can drop the Quattroporte without stiffening it, or vice versa. Pillowball top mounts on the front and rubber-isolated mounts at the rear keep noise transfer under control on a saloon car. Spring rates are matched to the M139’s kerb weight rather than carried over from a generic application, and the kit ships with the Maserati-specific cancellation module that defeats the Skyhook fault code at the cluster.

Fitment for the Maserati Quattroporte M139 (Cancellation Kit for Electronic Damping) (2003-2012)

This kit fits the M139 chassis Quattroporte from 2003 to 2012 and is specified as the cancellation variant – meaning your car left the factory with Skyhook electronic damping. Confirm your VIN-stamped chassis code reads MS04-C and that the OE struts on the car carry the Skyhook wiring plug before ordering.

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Configure your spring rates and ride height below.