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To answer your question: should not sound fluttering during accelerations, might want to check your injectors, plugs, and coils.
The logic is this: leaky injectors foul plugs and make the coils overwork and then fail prematurely.
On the sound, it is because of how the exhaust manifold is designed to enable more even exhaust flow for the turbos, which essentially takes away the typical v8 'rumble', and sounds more like a flat plane v8.
Good luck!
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