M139 is a rear wheel drive automobile platform

Automobile platform

An automobile platform is a shared set of common design, engineering, and production efforts, as well as major components over a number of outwardly distinct models and even types of automobiles, often from different, but related marques...

 developed by Maserati

Maserati

Maserati is an Italian luxury car manufacturer established on December 1, 1914, in Bologna. The company's headquarters is now in Modena, and its emblem is a trident. It has been owned by the Italian car giant Fiat S.p.A. since 1993...

 for use in a range of vehicles in the Fiat

Fiat

FIAT, an acronym for Fabbrica Italiana Automobili Torino , is an Italian automobile manufacturer, engine manufacturer, financial, and industrial group based in Turin in the Italian region of Piedmont. Fiat was founded in 1899 by a group of investors including Giovanni Agnelli...

 group. It underpins the 2004 Maserati Quattroporte

Maserati Quattroporte

The Maserati Quattroporte is a luxury four-door saloon made by Maserati in Italy. The name translated from Italian literally means "four doors". There have been five generations of the car, each separated by a period of roughly five years....

, 2007 Maserati GranTurismo

Maserati GranTurismo

The Maserati GranTurismo is a two-door 2+2 coupé produced by Maserati, it shares the platform of the Maserati Quattroporte V.-GranTurismo :...

 as well as the 2010 Maserati GranCabrio and also forms the basis of the 2007 Alfa Romeo 8C

Alfa Romeo 8C Competizione

The Alfa Romeo 8C Competizione is a sports car produced by Italian automaker Alfa Romeo. It was first presented as a concept car at the 2003 Frankfurt Motor Show and later released for sale for the 2007 model year...

 and 2008 Ferrari California

Ferrari California

The Ferrari California is a grand touring sports car that was launched by Ferrari at the 2008 Paris Motor Show. It is a two door "2+2" hard top convertible. The California is powered by front-mid mounted gasoline direct injection V8 with...

 model.

It is reported that a shorter version of the platform will underpin the next generation Dodge Viper

Dodge Viper

The first prototype was tested in January 1989. It debuted in 1991 with two pre-production models as the pace car for the Indianapolis 500 when Dodge was forced to substitute it in place of the Japanese-built Stealth because of complaints from the United Auto Workers, and went on sale in January...

.