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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications 2021 m340i no pops/burbles

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      10-26-2020, 01:12 PM   #1
basicm340i
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2021 m340i no pops/burbles

So I got this 2021 m340i with 600 miles already. The car doesn’t sound like 2019/2020s. It’s got this mild hybrid system. The car has virtually no pops or burbles. I can get 1 or 2 pops on sport plus second gear revving to 3k and letting go but they’re not even loud.
Does anyone know how i can get the car to pop like the older models without catless downpipes and a tune?
I talked to the dealership and they told me 21s don’t have pops and there’s nothing they can do for me.
It doesn’t even have a resonator to delete.
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      10-26-2020, 01:21 PM   #2
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I will record and post the exhaust video tomorrow
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      10-26-2020, 01:25 PM   #3
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Quote:
Originally Posted by basicm340i View Post
So I got this 2021 m340i with 600 miles already. The car doesn’t sound like 2019/2020s. It’s got this mild hybrid system. The car has virtually no pops or burbles. I can get 1 or 2 pops on sport plus second gear revving to 3k and letting go but they’re not even loud.
Does anyone know how i can get the car to pop like the older models without catless downpipes and a tune?
I talked to the dealership and they told me 21s don’t have pops and there’s nothing they can do for me.
It doesn’t even have a resonator to delete.
It's really a function of the tune - even a catless downpipe is not really going to help matters all that much.
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      10-26-2020, 01:28 PM   #4
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Originally Posted by chenry View Post
It's really a function of the tune - even a catless downpipe is not really going to help matters all that much.
What kind of tune could I get? I’ve heard with the new software BMW flags your car if you tune it
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      10-26-2020, 01:50 PM   #5
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Quote:
Originally Posted by basicm340i View Post
What kind of tune could I get? I’ve heard with the new software BMW flags your car if you tune it
And then we get into a whole different conversation that has been well covered here and in other sections of this forum regarding modifications and warranty. I'll summarize (deep breath here I go LOL)

CliffNotes (I'm dating myself):
  • any modification whether it be a flash (Mission Performance, BM3, MHD etc...), a 2 wire piggyback (JB+ etc...) a multi-wire piggyback (JB4, RaceChip etc...), coding (Bimmercode etc..), Lowering Springs (Dinan, H&R, Cobra etc...), Audio Upgrades (BavSound etc..), Intake (BMS, Injen etc...) and so on and so forth can potentially void the portion of your warranty that is linked to the modification. Now how each of these mods is detected is different but rest assured there is no hiding.
  • Also there is no "pro-active" voiding of warranty for any of the aforementioned
  • That said I personally have zippo concerns about any of the aforementioned mods causing a failure on my car so it's something that wouldn't keep me up at night - this is just based on my own personal experience - others opinions will vary - all good

So at the end of the day and getting back to your question....can you do any modification that that will not be detected (either proactively or by reverse engineering)? No you can't. Should you care? Up to you

Hope this helps

ps- I just had a fellow forum member (who drives a 2021) pay me a visit yesterday to check out my car (2020)- he was curious about the DP, Flash and Lowering Springs. I was happy to help him out, it was nice to meet a new SoCal BMW enthusiast and I think he left impressed by the sound and performance - we had a great drive up and down PCH.

Last edited by chenry; 10-26-2020 at 01:55 PM..
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      10-26-2020, 01:59 PM   #6
basicm340i
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Quote:
Originally Posted by chenry View Post
And then we get into a whole different conversation that has been well covered here and in other sections of this forum regarding modifications and warranty. I'll summarize (deep breath here I go LOL)

CliffNotes (I'm dating myself):
  • any modification whether it be a flash (Mission Performance, BM3, MHD etc...), a 2 wire piggyback (JB+ etc...) a multi-wire piggyback (JB4, RaceChip etc...), coding (Bimmercode etc..), Lowering Springs (Dinan, H&R, Cobra etc...), Audio Upgrades (BavSound etc..), Intake (BMS, Injen etc...) and so on and so forth can potentially void the portion of your warranty that is linked to the modification. Now how each of these mods is detected is different but rest assured there is no hiding.
  • Also there is no "pro-active" voiding of warranty for any of the aforementioned
  • That said I personally have zippo concerns about any of the aforementioned mods causing a failure on my car so it's something that wouldn't keep me up at night - this is just based on my own personal experience - others opinions will vary - all good

So at the end of the day and getting back to your question....can you do any modification that that will not be detected (either proactively or by reverse engineering)? No you can't. Should you care? Up to you

Hope this helps

ps- I just had a fellow forum member (who drives a 2021) pay me a visit yesterday to check out my car (2020)- he was curious about the DP, Flash and Lowering Springs. I was happy to help him out, it was nice to meet a new SoCal BMW enthusiast and I think he left impressed by the sound and performance - we had a great drive up and down PCH.
Damn thanks for the info man. Much appreciated!!!
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      10-26-2020, 02:04 PM   #7
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Quote:
Originally Posted by basicm340i View Post
Damn thanks for the info man. Much appreciated!!!
Oh sure I'm glad it helped
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      10-26-2020, 03:08 PM   #8
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The dealerships cant do anything. Everyone needs to be calling and complaining with BMW North America and not letting off until they add an option to have it back.
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      10-26-2020, 06:18 PM   #9
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Quote:
Originally Posted by basicm340i View Post
Quote:
Originally Posted by chenry View Post
It's really a function of the tune - even a catless downpipe is not really going to help matters all that much.
What kind of tune could I get? I’ve heard with the new software BMW flags your car if you tune it
Here what I was told by a BMW employee who has his car tuned. "Just do it. If anything goes wrong and bmw doesn't wants to void the warranty, they legally have to prove that what you did caused the issue." So if you blow the engine up somehow, bmw can't say you tuned it so that's why, they have to be able to show the tune is what caused the engine to blow up. I've read this in other places while doing research and apparently this is a law in the US, manufactures can't deny warranty until they prove your mods are what caused the issue.
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      10-26-2020, 07:11 PM   #10
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Just a thought because 2021 models are now not making any pops and engines has a mini hybrid motor.

Does this mean people that leased or purchased 2020 model m340i patiently have Equity because it makes the 2020 model more desirable?

Just 🤔...
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      10-26-2020, 10:47 PM   #11
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Quote:
Originally Posted by Musaabi View Post
Here what I was told by a BMW employee who has his car tuned. "Just do it. If anything goes wrong and bmw doesn't wants to void the warranty, they legally have to prove that what you did caused the issue." So if you blow the engine up somehow, bmw can't say you tuned it so that's why, they have to be able to show the tune is what caused the engine to blow up. I've read this in other places while doing research and apparently this is a law in the US, manufactures can't deny warranty until they prove your mods are what caused the issue.
I thought the main thing is BMW has new ECU's that are completely locked... So you can't tune it even if you want to.
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      10-26-2020, 10:50 PM   #12
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Is this a ploy to get us to buy the MPE?
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      10-26-2020, 11:13 PM   #13
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Quote:
Originally Posted by warrenw View Post
Quote:
Originally Posted by Musaabi View Post
Here what I was told by a BMW employee who has his car tuned. "Just do it. If anything goes wrong and bmw doesn't wants to void the warranty, they legally have to prove that what you did caused the issue." So if you blow the engine up somehow, bmw can't say you tuned it so that's why, they have to be able to show the tune is what caused the engine to blow up. I've read this in other places while doing research and apparently this is a law in the US, manufactures can't deny warranty until they prove your mods are what caused the issue.
I thought the main thing is BMW has new ECU's that are completely locked... So you can't tune it even if you want to.
That's true however that doesn't mean tuners won't find a way into the ecu. It's a computer and essentially every computer system can be hacked, it just needs time. But if you have a 2020 model you can tune it unless you have a certain software that locks that ecu but that's currently unlock-able you just need to send it in. Alfa Romeo did the same thing with 2018 builds that essentially had a firewall on the ecu but there was a plug-in that bypass it.
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      10-27-2020, 05:42 PM   #14
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Quote:
Originally Posted by Blubaron79 View Post
Is this a ploy to get us to buy the MPE?
It's a software thing, not hardware.
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      10-27-2020, 07:31 PM   #15
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I just went to dealership and tested 2021 m340 it definitely does not sound like the 2020 but it still has a decent pop and burble in a sport plus mode on the stand still revs. I am coming from Infiniti Q50 Red Sport to me i am happy with the 21 m340 exhaust sounds its deep sound pop and burble.
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      10-29-2020, 08:57 AM   #16
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Guys you must start to complain to dealership and they must complain to BMW.
Usually every next model year car should be better, but model 2021 is worse than 2020 since they put that 70kg extra weight on with shit-hybrid and cut pops/burbles.

Mine was build in October 2019 still old software (2019/07) on and shot like crazy
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      10-29-2020, 02:41 PM   #17
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Quote:
Originally Posted by G333 View Post
Guys you must start to complain to dealership and they must complain to BMW.
Usually every next model year car should be better, but model 2021 is worse than 2020 since they put that 70kg extra weight on with shit-hybrid and cut pops/burbles.

Mine was build in October 2019 still old software (2019/07) on and shot like crazy
THIS /\ /\ /\

Maybe we should round up a phone number for everyone to call and complain on. We dont want BMW to get away with this without a fight

Edit : 1-800-831-1117 BMW North America Customer Relations
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      10-29-2020, 03:27 PM   #18
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While I'd like to see this corrected for the '21 owners - I am really curious why the change was made in the first place. And what we are really fighting against


Was it sound regulations? Was it determined to be detrimental to the cats? Was it emissions related? Was it simply decided regulations or not the car was simply too loud?

Anyone have any insight? I know when the 2021 DME is cracked the aftermarket will provide a remedy to the situation but I also know that is not an answer for everyone.

Thanks all
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      10-29-2020, 03:33 PM   #19
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Went to test drive some M340s with a friend that was impressed after seeing mine. My 2020 model year built in July sounds a lot different. Downshifting it can sound like a gunshot in my car with a good bit of burbling. Could not replicate on the 2021.

Sales guy stated that perhaps the average m340i buyer is turned off by the aggressiveness of the pops/burbles or that they wanted to create more separation from full M3. Sure it was speculation on his part, but it sucks that they would change it.
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      10-29-2020, 03:51 PM   #20
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Quote:
Originally Posted by Auditobimmer42 View Post
Sales guy stated that perhaps the average m340i buyer is turned off by the aggressiveness of the pops/burbles or that they wanted to create more separation from full M3. Sure it was speculation on his part, but it sucks that they would change it.
They should at least include the option on whether or not you want the aggressive pop/crackle or not. Both Jaguar and Mercedes have separate exhaust buttons for this, which would have solved everything for BMW had they went this route.
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