Pretty much got is summed up! The Maserati tech learns from experience and interactions with the community. Sadly, Maserati (corporate) doesn't share a whole lot with the service department beyond what they need for day to day operations.BeerGuy, Thanks for your reply... Based on all of the info I have read and now with your response here is a summary of what I have learned:
1. ECU tuning definitely affects the sound of the Ghibli exhaust note
2. The Ghibli exhaust piping configuration was adjusted in 2019
3. Maserati has adjusted the ECU tuning on multiple occasions to address exhaust note issues but did not inform Ghibli owners, as far as I can tell from reading other posts, or give them a choice of one tune versus another leaving them to be surprised after having their car serviced that the revised ECU tune had changed the sound of the vehicle
4. The dealership tech's do not have all of this information available to them through Maserati; I know because that is where I started asking questions before I posted on this forum
5. This is Forum is the best place to get info on your Ghibli because the members are really knowledgeable and are willing to take the time to assist others...
Please correct me if I have misstated anything above...
Next step for me is to disconnect the exhaust vacuum line and if that doesn't provide the solution I am hoping for I will be asking for recommendations on an aftermarket alternative.
On #3, the first ECU update was Maserati not consistently meeting emissions standards ... that was a mandatory change. The others, as you indicate were subtle finetuning that over time created drift to where we are today.
As you said, the safest way to get more sound is try the vacuum line approach first. If not happy, I'm sure folks on the forum will be happy to share their thoughts / experiences.
Let us know how you made out.