[djrobx]

Originally Posted by Jusdande

The first minute at startup is really loud. It starts up at around 1200 to 1400RPM but slowly ramps down to 800 or so after maybe a minute. This happens every time you start it even if it has been running and it isn't because it's real cold here in Florida. Not so bad inside but outside it's loud. Guess I will get used to it as I'm told there is nothing they can do to stop it.

Someone on the X3 forum had their m40i engine tuned and had that behavior changed. It doesn't bother me at all, but in LA loud cars aren't exactly unusual.

[thekronoschef]

Originally Posted by RichM50d

That sounds great. I can't get mine to make that much noise, anyone got any tips?

Yep - code the left flap open with BimmerLink and pull fuse 203 while it's open. Both flaps open 100% of the time regardless of driving mode. Cold start is deafening.

[chicagofan00]

I wish I could get my M40i to pop and crackle even more than it already does in Sport/Sport+.

[ParadigmDawg]

The Burbles are a little much and somewhat random on the M40 but all in all, BMW has done a great job of making the Straight 6 sound like a bigger motor.

Here is how my twin turbo V8 sounds with just revs up to 1,200 rpm.

[MechX3M40i]

Originally Posted by chicagofan00

I wish I could get my M40i to pop and crackle even more than it already does in Sport/Sport+.

For pops and bangs: Gear shifter from "D" to left at "S". Still not enough? Try manual shifting and get the revs super high and drop it fast to force even more fuel dumping...

For General loudness - delete muffler and resonator. Be careful though, you might also end up deleting your eardrums too :

Still thirst for more? Install two 12" subs and a 1600W amp in your trunk, and connect ASD to them...

[chicagofan00]

Originally Posted by MechX3M40i

For pops and bangs: Gear shifter from "D" to left at "S". Still not enough? Try manual shifting and get the revs super high and drop it fast to force even more fuel dumping...

For General loudness - delete muffler and resonator. Be careful though, you might also end up deleting your eardrums too :

Still thirst for more? Install two 12" subs and a 1600W amp in your trunk, and connect ASD to them...

I already have it coded to start in Sport mode and then always shift over to sport shifting as well.

I've thought about the muffler/resonator deletes but have a feeling the wife would complain too much. Really hoping some good aftermarket exhausts get released this year...

[TX3M]

Originally Posted by Jusdande

What do you mean by "defeated ASD?" My wife hates the loud exhaust.

Disabing ASD does not reduce the "actual" exhaust sound, it just cancels the "fake" engine and exhaust sounds that are pumped into the cabin through the stereo system. Here's how to disable ASD without coding (many of us have done this and are quite pleased with the results):

https://x3.xbimmers.com/forums/showthread.php?t=1565456

Regarding the pops and bangs:

Here is the post by a member who had the pops and bangs tuned out:
https://x3.xbimmers.com/forums/showthread.php?t=1531197

Another option that eliminates pops and bangs which does not require tuning:

In the "Sport Individual" mode, you can set your preferences for Engine, Transmission and Steering. If you select "Comfort" for the Engine setting, there are no pops and bangs. Also, since the engine is in Comfort, the second exhaust flap remains closed so the overall exhaust noise is reduced (just like when you are in full Comfort mode). You can leave the Steering and Transmission set to Sport or Sport Plus so you still get the quick shifts and the engine generally remains in the higher rev range. It's a really good compromise, and your wife should be pleased with this.

[vmbmw]

Hey there,

New to bimmerpost but came across this thread after purchasing my 2021 x4 m40i.

The car currently has about 200+ miles on it and doesn't have any sort of exaggerated burps or gurgles even when it's in sport pus.

Curious if i'm missing something in regards to making the exhaust louder or having that sort of muffled backfire.

Any suggestions are appreciated.

Thanks!

[suby01]

Originally Posted by vmbmw

Hey there,

New to bimmerpost but came across this thread after purchasing my 2021 x4 m40i.

The car currently has about 200+ miles on it and doesn't have any sort of exaggerated burps or gurgles even when it's in sport pus.

Curious if i'm missing something in regards to making the exhaust louder or having that sort of muffled backfire.

Any suggestions are appreciated.

Thanks!

Hi welcome. A few posts down we were talking about the 2020 having quieter exhaust and the 2021 perhaps has a even quieter one. The loud ones were the older years. 18-19.

X3M40I Exhaust https://x3.xbimmers.com/forums/showthread.php?t=1773361

[vmbmw]

Originally Posted by suby01

Hi welcome. A few posts down we were talking about the 2020 having quieter exhaust and the 2021 perhaps has a even quieter one. The loud ones were the older years. 18-19.

X3M40I Exhaust https://x3.xbimmers.com/forums/showthread.php?t=1773361

I see - Thanks for pointing me in the right direction. Wish I would have found that our prior to acquiring the 21 however, great car none-the-less.

Cheers.

[XxDanoxX]

Originally Posted by Jusdande

Now if I could just stop the loud exhaust when you first start her up. Some may like that but it sounds like something a teenager would modify a car to do. I am embarassed around my adult friends.

What!?

Would you feel the same if you were starting an Aston Martin??

[suby01]

Originally Posted by vmbmw

I see - Thanks for pointing me in the right direction. Wish I would have found that our prior to acquiring the 21 however, great car none-the-less.

Cheers.

If you want it to be louder your options are to go aftermarket. All info is in the forum if you want to explore.
You can do either a exhaust upgrade or a tune.
For exhaust you can go custom made catback or get a downpipe. And with a tune you can adjust burbles and pops all day long.

[vmbmw]

Originally Posted by suby01

If you want it to be louder your options are to go aftermarket. All info is in the forum if you want to explore.
You can do either a exhaust upgrade or a tune.
For exhaust you can go custom made catback or get a downpipe. And with a tune you can adjust burbles and pops all day long.

Awesome! Thanks for following up - I'll look into the forum and circle back around to see what your thoughts are on the options.

Would you suggest one over the other? (Exhaust upgrade or Tune) or is it more personal reference.