90 seconds of gate practice, SRD250, betaflight, FPV racing drone

Strapped the camera on for the last lipo before dark.
My quad always sounds angry for some reason.
Something is buzzing or vibrating and I can`t figure out what it is.
Also it`s much faster without the Xiaomi Yi on top… just sayin`.
SRD250 v2
Emax 2204/2300 cooling
Lumenier autoshot
CC3D atom
Betaflight 1.11 luxfloat, default PIDs
3S 1300mah 45C
DAL 5045BN