All the concerns of the exhaust note of these cars I think have been highly overrated. Spent an hour in each last week and had multiple long tunnel runs with windows down.
I assure you there is nothing to be ashamed of what BMW has done here in stock form and aftermarket is just going to make it better. It's all business and everyone around you will know it's not a standard 3/4 series blowing by them
And this coming from someone with an E-race S85.
Cheers!