About sound you can get alot diffrent exhaust sound depending on how you route the exhaust pipes for example single pipe,two to one,two side by side,two side by side connected by an X ect.
And also how the exhaust manifolds are routed to the turbochargers.
All i want to say is that just because it is a I6 or V6 it doesnt have to sound a certain way.
And i guess BMW test some diffrent combinations.
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