BMW E92 Exhaust Problems

[Marginale]

Hello everyone, I’ve encountered the following problem.

I installed equal-length headers, and now there’s a terrible sound in the 1500–2000 RPM range. When I press the gas pedal, a horrible resonating noise appears. The same sound is also present when starting the engine.

I’ve been to two service shops. They inspected the inside with an endoscope, removed the rear muffler, and even took out the resonator — the sound only got louder. After 2000 RPM, the terrible noise completely disappears.

They also checked all the joints and inspected the headers for any damage — everything looks fine and intact.
I tried recording a video, but you can't really hear the noise in it
I’ll attach other videos where at least some of the sound can be heard.


https://www.youtube.com/shorts/eQRR5tX61lo