M3 CP Exhaust Overrun (or lack of it)

[Bicronical]

Hi All,

when I recently test drove an M4 CP, (with circa 3k miles on it) the exhaust overun (pop and crackle) was very noticeable in sport/sport+.

I have an M3 which has <1200 miles on it and the exhaust sound as described above is almost non-existent.

I have asked the dealer and they said that at the 1200 mile service they "flick some switches" that allows LC and "other things" that will create the exhaust sound that I sampled on the test car (I know some hate this overrun but it makes a boring commute more bearable for me).

Have you guys experienced the same re. the pre/post 1200 mile service?
Cheers.

[worsy]

I have an M3 CP with 4000 miles and can confirm it has pops/crackles. I bought it at 3900 so unfortunately can't comment on the pre service sound.

[Pib1978]

Mine is less than a week old and pops, crackles and burbles constantly when in Sport Plus and manual.
More noticeable in first and second if you lift off between 2k - 3k rpm.

https://www.youtube.com/watch?v=bq5UzE3YWvM

This was quite a cold evening - not sure if that makes much of a difference to the amount of overrun burbles.

[bigtime]

I'd be embarrassed driving round with that farting and crackling every time I backed off the accelerator.

[DC-1]

My comp pack has had the overrun burbles in sport + since day one.

Sounds like there may be a mapping issue with yours.