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The 330i has the exhaust flap. I disconnected it a while ago (aka "golf tee" mod) and it sounds nice and deep at low revs.
I wanted more noise though so recently fitted a custom sports back box and 3" tailpipes.
After reading this thread I'm thinking of getting the noxem and then doing a secondary cat delete.
At the moment my exhaust only has a very slight burble so I'm hoping the nox cat delete creates louder burble/crackle.
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