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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Before you ask why your exhaust is broken and why only one side is dirty: READ THIS!
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      02-21-2017, 12:10 PM   #45
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Quote:
Originally Posted by goj View Post
I hate having to clean both tail pipes, can I code the valve to be permanently closed so I only have to clean one?
I love polishing my tips regularly!!
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      03-17-2017, 03:15 PM   #46
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2016 BMW 340i  [4.50]
Quote:
Originally Posted by nozydog View Post
My car does exactly as you describe and I can't see any reason to do the unplug mod when all you have to do is push 'sport' after start up! I suppose it may sound more meaty on start up with the flap open but, apart from that there seems no reason to me to mess with it, particularly as the world class engineers at BMW designed it this way for a reason!!
what's the reason?
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      03-17-2017, 09:30 PM   #47
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Quote:
Originally Posted by hollandog View Post
what's the reason?
are you saying you don't think there is a reason? The first post on this thread suggests some possible reasons!

Last edited by nozydog; 03-17-2017 at 09:39 PM.
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      03-26-2017, 05:49 PM   #48
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Good to read this sticky! Yes, the discussion will still keep popping up all over the forums. LOL
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      04-09-2017, 07:19 PM   #49
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I noticed that someone mentioned that if you have the MPE (which I will be installing next week), it will be opened on comfort mode? How does the car know you have a MPE? I don't recall any coding involved in installing a MPE...
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      04-10-2017, 11:00 AM   #50
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Quote:
Originally Posted by turbocomppro View Post
I noticed that someone mentioned that if you have the MPE (which I will be installing next week), it will be opened on comfort mode? How does the car know you have a MPE? I don't recall any coding involved in installing a MPE...
No, but after the car warms up both pipes work on my MPE in comfort. I don't know why
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      04-10-2017, 05:08 PM   #51
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Quote:
Originally Posted by Blubaron79 View Post
No, but after the car warms up both pipes work on my MPE in comfort. I don't know why
That is indeed strange. I do wonder if it has any other positive function besides controlling emissions and sound.
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      04-19-2017, 02:48 PM   #52
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Quote:
Originally Posted by Chris_Azz94 View Post
First off I apologize I'm new here. Quick question about the flap though. Not sure if this was the right place to reply but, If I consider doing a muffler delete and remove the flap completely (just replace with a Y.) Will I get a CEL or any other malfunction?
I'd like to know too. Anyone?

Quote:
Originally Posted by turbocomppro View Post
That is indeed strange. I do wonder if it has any other positive function besides controlling emissions and sound.
Warming up the cat faster is also for emissions, so i guess we're just saving polar bears (quote needed) with this, nothing more.
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      05-12-2017, 09:23 AM   #53
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Great pictures on this post -- thanks. I used a plastic "zip tie" to basically do the same thing. But I like your metal clip idea better.
Have done the zip tie on my last 2 cars. 335i and now 435i. Exhaust note does sound slightly better with that 2nd butterfly valve is open all the time.

You're right...takes 3 minutes max.
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      06-18-2017, 05:29 PM   #54
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Great info in this post. Thanks for the help!
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      07-25-2017, 08:22 PM   #55
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Total Noob here. Just got my '15 435i xdrive convertible last Friday. Haven't had enough time to notice this exhaust "phenomenon" but now I know if I notice it. Thanks.
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      08-04-2017, 05:53 AM   #56
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Both my tips have exactly the same amount of carbon deposit on, I guess that proves that the flap is always open in sport mode, as I ALWAYS use sport mode. Can't accept the dull throttle and light steering in comfort mode!
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      08-08-2017, 08:43 AM   #57
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Quote:
Originally Posted by Rick Hunter View Post
2016 F36 435xi here. Exhaust valve logic for other F3x does not equate to F36. Tried everything, and CANNOT get the valve to open. If there's another '16 F36 owner that has figured it out... don't bother explaining it to me... I've gone to option 2, and it took less time compared to everything I've done above.

Decided to do the U-Clip disconnect. 10 minutes total DIY, and no need to disconnect any harnesses. Easy to reconnect if I ever need to.

Here's a view of the clip in place from the other side of the exhaust:


Here's the clip (on my work towel :-)


...and the wire that keeps the flap in the open position:
Nice work towel!
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      10-21-2017, 09:20 PM   #58
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Thanks!
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      10-22-2017, 08:37 AM   #59
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Hey, alternatively can't you just unplug the module after both valves are open and the baffles will permanently stay open?
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