One of the forum members did a retrofit of the sound tube to an M, and I rode in his car. It sounded cool, but not nearly as cool as an AFe or GruppeM. I think it would be something to do if you want to keep the intake stock and just want a bit more noise, but to be honest, you could only tell a difference around 3-6K if you are really on it, otherwise it sounds mostly the same in other RPM ranges.
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