I drove a 328i with the sport package for 3 years and I never encountered anything you have described except the unexceptional engine noises, and I was coming from a 340hp S4 V8. It's not a rocket, but it's definitely not a "DOG". You should probably have it checked out to see if there are problems that could affect performance. I've also never heard a booming hum at 60mph. Sorry you are having a bad experience with it.
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