Hi I fitted a grounding kit to my Nissan 350Z on recommendation from a lot of the owners on the 350Z forum. All I can say is that I noticed a distinct improvement in responsiveness; the car just felt somehow more alive. Obviously, this was a Nissan and we are talking Maserati here so I would like to think that the electronics in the Maserati are pretty well sorted over a more mainsteam car - Would be interested to here from someone that had actually fitted a kit though???
Today's cars do not use electrical paths as earlier models did. Thus there is less need for grounding.
The mechanical interfaces are run over the CAN system (controller area network). These include heat, A/C, instruments, lighting control, etc.
All other control signals run over the MOST digital optical interface. All radio, voice, CD, nav, phone, etc run over this system as digital bits through a digital optical cable similar to that used in your home audio system.