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Dual m exhaust but only one side works??
I just installed the M performance mufflers on my 650i sound is good but wish it was a little louder. However I noticed that when I rev the engine the sound is coming out of driver's side only.
This is a V8 engine so unless there is a valve in the central muffler it should come out of both sides right?
650 owners can you please confirm if this is normal?
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