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Originally Posted by twelve535i
I've been really interested in this type of mod since I saw a thread where M3's were having it done.
What I'm not quite clear on is how sealing up all the holes in the muffler produces less drone and a different sound than straight piping.
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Because the Helmholtz chamber is still in tact.
It's louder but not to the point where it will emit unbearable drone.