Hi all, need some help identifying the noise at the beginning of this vid and sporadically throughout. It only happens when under throttle, but I can't replicate the noise when in neutral. Happens mainly around 15-30mph and is worse when car is cold. I am wanting to confirm if this noise is from the cats since I know they are rusted. The rattle is more than just the heat shields I think so afraid this might be internal.

The sound is heard very briefly at the start, again at 7-8 sec, 17-20 sec, and 27-30 sec.


I have HFCs on order but 3 months away so if there's any way to temporarily solve this please let me know! I will be taking it to a shop on Friday to see if we can hear it up on the lift.