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

The Quattroporte M139 was sold as a four-door GT with Skyhook adaptive damping, and that electronics module is exactly what kills a coilover swap on this car. Pull the OE struts and the dashboard lights up like a fault-code Christmas tree. The XYZ Racing Pro Rally coilover for the Maserati Quattroporte M139 ships with the dedicated cancellation kit that signs off the Skyhook ECU so the car runs cleanly on passive damping.

Pro Rally is the gravel-and-loose-surface tune in the XYZ range, which means long stroke, high-rate springs, and damping built to survive repeated heavy hits. On a 1,930kg Italian saloon that is an unusual brief, but it is the right pick if the car is being prepared for hillclimb, rally support, or a private collection that wants a properly rebuildable suspension rather than another £4,000 set of Skyhook struts.

What this coilover does for your 2003-2012 Maserati Quattroporte M139

The Pro Rally damping curve is set up to absorb compression events without packing down, which on the long-wheelbase Quattroporte translates to a car that stays composed when the road surface gets broken or cambered. The cancellation kit is the bit that matters day to day: it stops the Skyhook controller throwing a warning, keeps the dash clean, and means the car drives as a normal mechanical platform. Ride height is fully adjustable via the lower mount, so corner balance and rake can be set on a proper four-post without compressing the spring. Spring rates are matched to the M139’s front-heavy, rear-drive layout – the front Ferrari-derived V8 sits well behind the axle line but the nose still carries weight, and the Pro Rally tune accounts for that. The result is a Quattroporte that handles surface changes the way a proper rally car does: pliant on the hit, controlled on the rebound, never bottoming out.

About the Pro Rally coilover

Pro Rally sits at the gravel-spec end of the XYZ Racing range. Construction is monotube with a separate spring perch and threaded lower body, finished to resist stone-chipping and salt spray. Damping is fixed-rate per the Pro Rally tune – this is not a 30-click circuit coilover, it is a long-stroke loose-surface set-up where the valving is the spec. Camber adjustment is built into the front top mounts. The cancellation kit for the M139’s electronic damping ships in the box and replaces the Skyhook signal feed so the OE control module is satisfied without any pedal-box workarounds or dash modules. Rebuildability is the long-term story here: every unit is fully serviceable, with replacement seals, shafts and valving available from XYZ Racing rather than scrapped at the first sign of weep.

Fitment for the Maserati Quattroporte (2003-2012)

This kit is built specifically for the M139 Quattroporte chassis, model years 2003 to 2012, including the early ZF automatic and the later DuoSelect cars. It includes the electronic damping cancellation kit required for any M139 originally specified with Skyhook adaptive suspension – so the install does not throw a permanent fault on the dash.

What buyers also search for

• Maserati Quattroporte M139 coilover conversion to replace failed Skyhook struts
• M139 Quattroporte suspension upgrade with electronic damping cancellation included
• Rally-spec coilover for heavy GT saloons with long damper stroke
• Rebuildable Quattroporte coilover as an alternative to dealer-only Skyhook replacement
• Pro Rally tune for hillclimb and loose-surface use on rear-drive Italian saloons

Configure your Pro Rally spec for the M139 Quattroporte below – top mount, spring rate and ride height are all set at order.