Is a loud engine normal for an E350 Sport?




Forgive this ignorant question. I just got my first Mercedes.
I've noticed that the engine is a lot louder in the cabin than my prior cars (Lexus, Toyota, Honda, Jeep), particularly while accelerating. It's a "throaty" noise - like a sports car. As I have the E350 Sport, I could see it being the case to a degree. However, is it really normal to be so loud from the cabin? Have any of you noticed this?
I've been told by a friend that generally European cars have louder engines than Japanese cars.
Just trying to make sure it's not something wrong like a bad muffler.
Thanks for your help.






