A GTAm ? No, I've never seen one, let alone heard one tbh. There's a Quadrifoglio that I have seen locally a few times and admittedly does sound a little anodyne.
The GTAm comes with an Akrapovič exhaust, so should sound somewhat better when being driven in anger. Of course it'll never sound as good as a NA V8 or awesome V10, but then again turbo'd cars never do by their nature.
Even the Maserati MC20 comes with a turbo'd V6 that sounds disappointing compared to some of its predecessors apparently - still wouldn't say no to one.....