According to factory figures, a total of 2,400 Quattroporte IV, including Evoluzione models, were produced.
However, according to production figures quoted in the book "Maserati in the Third Millenium" by Enio Gollinelli (published in 2001), the total production for the Quattroporte IV was 2841, made up of the following:
2.0 Quattroporte seicilindri: 587 built between 1994 and 1998
2.8 Quattroporte seicilindri: 668 built between 1994 and 1998
3.2 Quattroporte ottocilindri: 415 built between 1996 and 1998
These figures are identical to figures sent to me by the factory in 1998, so we can assume that they are correct. According to the official Maserati site, these three model were discontinued in 1997, to be replaced by the Evoluzione models.
2.8 Quattroporte V6 evoluzione: 241 built between 1997 and 2001
2.8 Quattroporte V6 evoluzione Automatic: 148 built between 1997 and 2001
According to the official Maserati site, production for this model began in 1998
3.2 Quattroporte V8 evoluzione Manual: 258 built between 1998 and 2001
3.2 Quattroporte V8 evoluzione Automatic: 524 built between 1998 and 2001
A later book, Maserati The Grand Prix, Sports and GT cars model by model, 1926-2003 by Maurizio Tabucchi (published in 2003) quotes a total production figure of 2,400.
The official factory figures quoted are:
2.0 Quattroporte seicilindri - 587 units
2.8 Quattroporte seicilindri - 668 units
3.2 Quattroporte ottocilindri - 415 units
2.8 Quattroporte V6 evoluzione - 390 units
3.2 Quattroporte V8 evoluzione - 340 units
A total production figure of 2,400 units.
http://www.maserati-alfieri.co.uk/alfieri291.htm