My 2008 4.2 GT had a Bose system.
Bose system <> Bose
NIT though
From the Academy book:
Three hardware versions are available for the Magneti Marelli NIT:
HW 7: only for the GranTurismo up to Assembly 42930, and for all models for the Japanese market
HW 8.0: GranTurismo from MY09 (from Assembly 42931), Quattroporte Restyling and GranCabrio for all the markets, except USA, Canada and Japan
HW 8.1: GranTurismo from MY09, Quattroporte Restyling and GranCabrio (GranTurismo Convertible) for USA and Canada markets
As far as I can see the Bose NIT was only fitted to the QP
The Bose NIT is available as option for the Quattroporte Restyling (MY09 & MY10)
The Bose NIT is a standard equipment for the Quattroporte Restyling model (MY09 & MY10), for the USA and Canada markets.
Since February 2010, the Bose NIT is no longer available for all the markets.
Bose DSP shouldn't make much difference, but Matt is the guru.
C