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I just got a F12 and I am still on the same boat as you. But when I had a camaro I purchased after market MRT exhaust which was smooth and all but I wanted my car to sound louder so I changed it to straight pipes and loved it. I used to drive from Pittsburgh to Chicago all the time and with little music in the back ground drone is not even noticeable. Not sure how a straight pipe would sound on a bmw though.
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