Hey guys, I’ve just got myself a 2010 e70 40d (N57 not m57) and am looking into removing the dpf and egr. Most of the videos on YouTube of the sound when dpf is removed, has a turbo whistle at idle, some do say they also have a full exhaust though. Just wondering if that turbo whistle is to be expected by removing dpf unit and replacing with aftermarket pipe, or if it will only be noticeable with a full exhaust system?

If it is to be expected, is there something I can put in the exhaust to help quieter it? Like a resonator maybe?

I really want to remove the dpf and egr, but love the way car currently sounds.

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2004 X5 3.0d
2010 X5 40d

New Zealand