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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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      01-15-2018, 03:50 PM   #67
BMRSEB
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Quote:
Originally Posted by BMRSEB View Post
To address the muffler delete question, since I recently did the muffler delete.. No, no check engine lights or any codes stored.. I just wrapped up the connector neatly and tucked it under the bumper.. There's a nice little "shelf" for it..

However, be prepared for drone at low speeds, high load and cruising! To the point where, I am considering putting the stock muffler back on and perhaps at some point getting the AA exhaust or similar.

At (cold) startup it sounds loud as hell, then drops down to a nice rumble, would be nice if this low rumble was the "stock" sound, post muffler delete.. I will miss the pops and crackles at gas let off, but growing tired of having to shift to combat drone..
Well, went ahead and did it! Put my muffler back on.. I guess le$$on learned.. lol.. I could not take the droning at low speeds and also when you give it (more) gas at higher speeds without downshifting..

I do miss the crackles and pops at "let off" though.. still there but much, much, more subdued.. At some point will consider complete exhaust/muffler options, AWE, MPE, etc..

Just a PSA for those considering muffler delete, my personal opinion of course..
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      01-15-2018, 10:02 PM   #68
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I actually got flagged down by a guy in slow bumper to bumper traffic who had been following behind my car. He rolled alongside and motioned to roll down my window, he was all concerned and wanted to let me know my exhaust had something “stuck in it” on the left side. I laughed and said its a flap and they all were like that!

True story and third day with the car!
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      01-22-2018, 01:58 PM   #69
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Quote:
Originally Posted by paimon.soror View Post
PS. the bit about backpressure is hogwash. wayyyy too far downstream to impact backpressure lol.
I disagree go and get a potato and plug the pipe and see what happens to back pressure lol. I bet you can't drive far
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      01-22-2018, 02:52 PM   #70
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Well sure if you block a flow, that flow has to go somewhere... but i would have been surprised if a simple flap that doesn't fully seal off the outlet would have really caused that much additional back pressure.

But I can admit my ignorance if it really does
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      02-15-2018, 11:54 PM   #71
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Originally Posted by Blubaron79 View Post
On my MPE both pipes open up after warm up even in comfort. Which my previous two 35i models did not with the stock exhaust.
I also have the MPE, and both valves (at least on mine) are open - all the time. I checked using a flashlight, and the valve actually does not close when the car is off either, although I did read that that's probably normal.

I know normally the one valve is supposed to be closed on a cold starts, but I have started my car in the winter in literally -15C temperatures, after being parked overnight and I notice smoke coming out of both exhaust pipes.

Not sure if that's a good thing, anyone know if its a problem if both valves stays open on cold starts?
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Last edited by floor_it; 02-15-2018 at 11:59 PM.
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      02-15-2018, 11:56 PM   #72
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Quote:
Originally Posted by floor_it View Post
Quote:
Originally Posted by Blubaron79 View Post
On my MPE both pipes open up after warm up even in comfort. Which my previous two 35i models did not with the stock exhaust.
I also have the MPE, and both valves (at least on mine) are open - all the time. I checked using a flashlight, and the valve actually does not close when the car is off either.

I know normally the one valve is supposed to be closed on a cold starts, but I have started my car in the winter in literally -15C temperatures, after being parked overnight and I notice smoke coming out of both exhaust pipes.

Not sure if that's a good thing, anyone know if its a problem if both valves stays open on cold starts?
I can say both are open all the time on the 340 with the MPPK. :-)
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      02-16-2018, 01:16 PM   #73
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i tried on my 320d 2014 coud'nt even locate where is my actautor?
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      02-21-2018, 04:41 PM   #74
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Quote:
Originally Posted by Blubaron79 View Post
Moral of the story is: buy the MPE
I have a 2016 340i and mine has 1 dirty and 1 clean exhaust and on cold mornings I see more white smoke out of 1 pipe than the other...this is an awesome sticky thread, btw...kudos to the OP!
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      03-21-2018, 08:42 AM   #75
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Very useful information, thank you!
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      04-14-2018, 12:22 AM   #76
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It's interesting because I don't notice a difference in exhaust tone whether the flap is open or closed. Maybe just a little bit more burble when decelerating in 1st in a parking garage with the windows down.
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      04-22-2018, 04:02 PM   #77
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Any tips for buying a used 2015 335i
Things to look for like
oil leaks
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      07-22-2018, 01:58 AM   #78
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Excepet warming up, i cannot make sense of why the car wanna close one exhaust even, or especially at eco pro mode. More exhausts means Less back pressure means better fuel economy right?
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      08-06-2018, 04:23 PM   #79
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Quote:
Originally Posted by Cyanfall View Post
Excepet warming up, i cannot make sense of why the car wanna close one exhaust even, or especially at eco pro mode. More exhausts means Less back pressure means better fuel economy right?
Exhaust backpressure has to be balanced. I'm not going to pretend that I understand it, but there is a point where it's more efficient to have a certain amount of backpressure. That's why headers and exhaust design is actually more important than just making big pipes from the car go out the back.
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