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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions 2021 M340i vs 2020 M340i Exhaust Comparison Shows 2021 Sounds Different

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      11-08-2020, 11:40 AM   #45
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I'm still in shock because the more I drive my '21 the more it pops and burbles more and more. I'm not sure if it's break in that making it sound better. In the high rev ranges I hear a multiple pop/bang sound it's inconsistent, in the sense of after that pop if the car is holding the gear if I give it throttle let off before the the up shift it won't pop. I'll have to wait a couple seconds the rev drop a little give it throttle it pops again.
on a 21? can you post a video!
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      11-08-2020, 12:09 PM   #46
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Originally Posted by Casone238 View Post
I'm still in shock because the more I drive my '21 the more it pops and burbles more and more. I'm not sure if it's break in that making it sound better. In the high rev ranges I hear a multiple pop/bang sound it's inconsistent, in the sense of after that pop if the car is holding the gear if I give it throttle let off before the the up shift it won't pop. I'll have to wait a couple seconds the rev drop a little give it throttle it pops again.
on a 21? can you post a video!
I don't have much videos but there are 2 that I do have https://1drv.ms/f/s!AlhMhOlN6bC9gZUydet8mMxw9HKZVA
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      11-08-2020, 12:11 PM   #47
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Quote:
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Originally Posted by hemi to e90 View Post
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Originally Posted by Casone238 View Post
I'm still in shock because the more I drive my '21 the more it pops and burbles more and more. I'm not sure if it's break in that making it sound better. In the high rev ranges I hear a multiple pop/bang sound it's inconsistent, in the sense of after that pop if the car is holding the gear if I give it throttle let off before the the up shift it won't pop. I'll have to wait a couple seconds the rev drop a little give it throttle it pops again.
on a 21? can you post a video!
I don't have much videos but there are 2 that I do have https://1drv.ms/f/s!AlhMhOlN6bC9gZUydet8mMxw9HKZVA

That's great !!! You are the only 21 I know that burbles or pops!!! The thread in the b58 section would appreciate this
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      11-08-2020, 12:19 PM   #48
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Originally Posted by Casone238 View Post
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Originally Posted by hemi to e90 View Post
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Originally Posted by Casone238 View Post
I'm still in shock because the more I drive my '21 the more it pops and burbles more and more. I'm not sure if it's break in that making it sound better. In the high rev ranges I hear a multiple pop/bang sound it's inconsistent, in the sense of after that pop if the car is holding the gear if I give it throttle let off before the the up shift it won't pop. I'll have to wait a couple seconds the rev drop a little give it throttle it pops again.
on a 21? can you post a video!
I don't have much videos but there are 2 that I do have https://1drv.ms/f/s!AlhMhOlN6bC9gZUydet8mMxw9HKZVA

That's great !!! You are the only 21 I know that burbles or pops!!! The thread in the b58 section would appreciate this
It pops a lot, yesterday I got this really loud gun shot kind of pop I wasn't able to get it to do it again. Even in comfort mode it pops usually on downshifts or engine rev'in. I'm not sure if my pops and burbles are due to the MPE
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      11-08-2020, 12:22 PM   #49
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Quote:
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Originally Posted by Casone238 View Post
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Originally Posted by Casone238 View Post
I'm still in shock because the more I drive my '21 the more it pops and burbles more and more. I'm not sure if it's break in that making it sound better. In the high rev ranges I hear a multiple pop/bang sound it's inconsistent, in the sense of after that pop if the car is holding the gear if I give it throttle let off before the the up shift it won't pop. I'll have to wait a couple seconds the rev drop a little give it throttle it pops again.
on a 21? can you post a video!
I don't have much videos but there are 2 that I do have https://1drv.ms/f/s!AlhMhOlN6bC9gZUydet8mMxw9HKZVA

That's great !!! You are the only 21 I know that burbles or pops!!! The thread in the b58 section would appreciate this
It pops a lot, yesterday I got this really loud gun shot kind of pop I wasn't able to get it to do it again. Even in comfort mode it pops usually on downshifts or engine rev'in. I'm not sure if my pops and burbles are due to the MPE
You should compare software versions? Maybe that has something to do with it
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      11-08-2020, 04:42 PM   #50
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When I took delivery it was already on latest update I believe cars slowly started getting notifications for this update. I didn't remember off the top of my head but I recall seeing a post about this huge update coming but all the 2021s already came with that update
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      11-08-2020, 06:39 PM   #51
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Can this be updated over air because my 2021 m340 that I picked up last month made a loud pop sound when letting off third for the first two or three weeks I had it. Now no matter what I do I can’t replicate it.
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      11-08-2020, 06:44 PM   #52
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Originally Posted by RedKloud View Post
I would be willing to trade my '20 for a '21 ... not a big fan of loud exhausts.
I am mostly with you, I don't mind the volume or general tone, but I think the intentional backfires cheapen the sound of the car. I avoid sport+ at times because of it.


I would love to hear more input from MY21s with more miles too.

Last edited by siegester; 11-08-2020 at 06:57 PM..
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      11-08-2020, 08:40 PM   #53
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thank you for the video

wow this is very disappointing but i hear this is software, anybody know any modification possible to bootmod or something
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      11-09-2020, 10:35 AM   #54
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That is odd, because I can definitely hear cracks and pops from the back of my 2021.
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      11-09-2020, 12:41 PM   #55
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M performance exhaust for the win! Must have for me with a 2020 or 2021.
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      11-09-2020, 01:04 PM   #56
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Quote:
Originally Posted by Cortexiphan View Post
That is odd, because I can definitely hear cracks and pops from the back of my 2021.
maybe it depends when the car was manufactured and some people got to keep their pops and burbles before cutoff ? When was your car manufactured ?
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      11-09-2020, 01:35 PM   #57
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Quote:
Originally Posted by siegester View Post
I am mostly with you, I don't mind the volume or general tone, but I think the intentional backfires cheapen the sound of the car. I avoid sport+ at times because of it.


I would love to hear more input from MY21s with more miles too.
+1

I don't really want my car making backfire gunshot-like sounds. I guess some people like that.
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      11-09-2020, 09:36 PM   #58
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https://share.icloud.com/photos/0j-B...VQw#Ridge_Hill

Here's a 3 min video of me casually driving around in sport + mode so ya can hear how often my '21 crackles & burbles. It didn't rev pass 3.5k. Towards the end I sped up a little
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      11-09-2020, 11:57 PM   #59
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Quote:
Originally Posted by Casone238 View Post
https://share.icloud.com/photos/0j-B...VQw#Ridge_Hill

Here's a 3 min video of me casually driving around in sport + mode so ya can hear how often my '21 crackles & burbles. It didn't rev pass 3.5k. Towards the end I sped up a little
That sounds good to me , do you have the MPE? That sounds pretty aggressive for the regular exhaust . I hope mine will sound this way I don't need more than that. Anything louder or more pops is overkill
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      11-10-2020, 06:58 AM   #60
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Quote:
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Quote:
Originally Posted by Casone238 View Post
https://share.icloud.com/photos/0j-B...VQw#Ridge_Hill

Here's a 3 min video of me casually driving around in sport + mode so ya can hear how often my '21 crackles & burbles. It didn't rev pass 3.5k. Towards the end I sped up a little
That sounds good to me , do you have the MPE? That sounds pretty aggressive for the regular exhaust . I hope mine will sound this way I don't need more than that. Anything louder or more pops is overkill
Yeah I do have the MPE it's very loud especially on start up
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      11-10-2020, 07:44 AM   #61
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Quote:
Originally Posted by Casone238 View Post
https://share.icloud.com/photos/0j-B...VQw#Ridge_Hill

Here's a 3 min video of me casually driving around in sport + mode so ya can hear how often my '21 crackles & burbles. It didn't rev pass 3.5k. Towards the end I sped up a little
Thanks for sharing. Sounds exactly like my MY21.

Seems that we're finding the 21s do have the exhaust sounds, maybe just not as pronounced and without big shotgun blasts. And I'm good with that.
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      11-10-2020, 08:01 AM   #62
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Quote:
Originally Posted by Casone238 View Post
https://share.icloud.com/photos/0j-B...VQw#Ridge_Hill

Here's a 3 min video of me casually driving around in sport + mode so ya can hear how often my '21 crackles & burbles. It didn't rev pass 3.5k. Towards the end I sped up a little
Like I said in the other thread you posted in, in Sport+ my 2020 with MPE sounded WAY louder than yours in that video especially on downshifts. It almost never stopped crackling and popping through all the RPMs. Your cold starts are still probably pretty loud, but the amount of pops and bangs sound more like mine did before I installed the MPE.

The MPE on the 2021 obviously makes it sound way better (IMO) but there is still something hampering the sound. You shouldn't have to get the MPE to have similar sound to the stock 2020's.
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      11-10-2020, 08:15 AM   #63
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Some of the newer models that have come out post opf have been reengineered to get around the muffling of the opf but for now your only option is mpe if you want to keep it factory
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      11-10-2020, 10:04 AM   #64
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I think I stated this before but I have heard a big gun shot sound come from the exhaust it's very inconsistent I usually hear during a full kick down when merging on freeway but again it's in consistent
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      11-10-2020, 10:13 AM   #65
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I think I stated this before but I have heard a big gun shot sound come from the exhaust it's very inconsistent I usually hear during a full kick down when merging on freeway but again it's in consistent
That's definitely an MPE thing. Scared the sh!t out of me the first time it happened as I had my windows down. The next time it happened, I was passing by shopping center, and half the people in the parking lot turned in my direction. lol I'm glad it didn't do that all the time or I would have had to go back to stock.
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      11-10-2020, 10:53 AM   #66
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Quote:
Originally Posted by Casone238 View Post
I think I stated this before but I have heard a big gun shot sound come from the exhaust it's very inconsistent I usually hear during a full kick down when merging on freeway but again it's in consistent
That's definitely an MPE thing. Scared the sh!t out of me the first time it happened as I had my windows down. The next time it happened, I was passing by shopping center, and half the people in the parking lot turned in my direction. lol I'm glad it didn't do that all the time or I would have had to go back to stock.
😂😂😂😂 same thing happened to me I had the windows down merged on the highway I was in rush and when I heard it scared the hell out of me also
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