Squeezing-the-cat weird roar

[labsy]

Hi guyz,

last week I went some offroading and at one steep incline needed to reverse. The departure angle was so sharp, that I shoveled the ground with exhaust tip, broke it...and also now I have this weird "miauu" squeezing sound when I hit the gas:
Short video with sound here

We've tried to pinpoint the source of this weird sound, but from side it seems to be coming from engine, but when diping my head into engine bay, it sounds like it's coming from behind.
Could it be turbo (it's EU 2.5l Turbo Diesel), being damaged by digging earth with exhaust?
Any idea?