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Wish it were that simple to get growl from the engine just by doing an intake.
I've thought the same thing about my 2010 335i. Even with a number of different intakes on the car, I did not see a noticeable increase in sound. Just a slight diverter valve whoosh (barely audible) at gear change.
Exhaust is really the best route to go to increase the sound, and there are lots of options out there that will give you sound without drone. So long as you aren't eliminating any Cats you should be okay drone wise.
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