M3 Strange noise when I start to accelerate S55

[Hugolreis]

Noise :

I can't figure out where this noise is. Whenever I start to accelerate it appears and/or when w makes a fart in the gear changes

 

[Hugolreis]

Solved!

 

[CalvinNismo]

What was it? And how did you solve it?

 

[Hugolreis]

What was it? And how did you solve it?

This part was not sealing and had a small gap in the car's exhaust (Bmw F87 M2 F80 M3 F82 M4 Flange

Steady Genuine 18307848046

A product was provisionally placed for exhaust gaskets until the original part arrives and is replaced