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#1
12-03-2019, 12:48 AM
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Dpf removal noise
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 
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#2
12-03-2019, 08:12 AM
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Does the NZ 40d have SCR or DOC?
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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim 2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim
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#3
12-03-2019, 03:57 PM
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Quote:
Thanks for the replies, I think I would probably grow to like the sound, and I guess if not, I can find a high flow cat to put in the system somewhere to help quieten it down. The egr system on this is also a bit of a bear. It appears to have a second cooler/heater right by intake manifold, for transmission fluid.
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2004 X5 3.0d 2010 X5 40d New Zealand
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#4
12-03-2019, 08:34 AM
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As soon as you remove the DPF and Catalytic converter you will hear the turbo whistle without a doubt. If you leave the Cat in it will remove it slightly or you can get an aftermarket Cat that cuts down on the smell as well as the whistle.
That being said, having your X5 sound like a jet fighter during take off is one of the cool things about doing a delete. Haha!
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#5
12-03-2019, 09:36 AM
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Hi- I have a fully deleted diesel. It sounds great, and I still have the factory muffler. It sounds more throaty from outside, and you definitely will hear the turbo whistle with the windows open. With the windows closed, you'll barely hear any difference. I kept the factory muffler beacuse I wanted it to be about the same sound level, though I'm thinking about putting an electric cutout in to be able to have an open dump to be louder.
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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle '01 330i- Drift car: SLR Super angle, BC coils- keep it simple '07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years
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#6
12-03-2019, 06:13 PM
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A DOC provides the same function as the SCR system except the SCR can provide for two reactions that reduce or eliminate NOx while a DOC, avaliable in two different versions, can only provide for one or the other. If I were deleting the SCR and DPF, I would have a DOC installed. I don't think removing the EGR will make a big difference noise-wise and since all you have is the DPF and probably a combination DOC, I don't think you'll hear too much of a difference. I recommend using a DOC anyway.
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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim 2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim
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