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I can't speak for the 320d, but I have an e70 x5d with the M57 engine (same as the e90 335d), and can 100% attest that a short intake like this just cranks up the "dieselness" of the engine. More whistle, more turbo noises, etc. I don't think there's a way to make a diesel engine sound like a petrol engine - they are just very different beasts.
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2001 e36/7 M Roadster 5spd
2008 e90 335i 6spd
2011 e90 335xi 6spd
2011 e70 x5 diesel
2010 Ducati Monster 696
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