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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > 430d exhaust legality/potential problems
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      10-28-2020, 06:06 PM   #1
JoshU
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430d exhaust legality/potential problems

So I had a question about a DPF-back exhaust system that will probably be easily answered by somebody more knowledgeable than me;

If this part of the exhaust is removed and replaced with a straight pipe will it pass an MOT and will it need any modification/tuning/cause any running problems at all?
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      10-29-2020, 02:05 AM   #2
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This is one of those cases where you might want to ask in the region specific forum to get an educated and swifter answer.
In the US we don’t have MOT, and didn’t get the 3.0 diesel either.
Shoot most places don’t have emissions or safety inspections anymore.
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      10-29-2020, 01:27 PM   #3
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Quote:
Originally Posted by Onizukachan View Post
This is one of those cases where you might want to ask in the region specific forum to get an educated and swifter answer.
In the US we don't have MOT, and didn't get the 3.0 diesel either.
Shoot most places don't have emissions or safety inspections anymore.
Very good point, I think you're right haha. Thanks.
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      10-29-2020, 06:06 PM   #4
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Short answer from a 30d owner in the UK...no, it won't fail an MOT as long as the DPF remains intact.

The presence of the DPF keeps the exhaust note and noise levels suppressed, so neither of those will be a problem if you remove the back box.
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      10-30-2020, 01:50 PM   #5
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Quote:
Originally Posted by Watsey View Post
Short answer from a 30d owner in the UK...no, it won't fail an MOT as long as the DPF remains intact.

The presence of the DPF keeps the exhaust note and noise levels suppressed, so neither of those will be a problem if you remove the back box.
I know the removal of the backbox is legal but it's more the other half of the exhaust I was slightly concerned about because I'm not sure what it is/does.

But that's reassuring so thank you.
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