Guys..sorry if this might be out of topic..

Whenever i accelerate my pedal to floor..there is extreme loud sound coming from below front left passenger side..It is extremely loud.
This is not engine noise i can confirm because the RPM are not that high..

Is this normal due to pedal to floor or some signs of exhaust leaks?
If yes,which part of it?

I dont get it..
The rest of my exhaust are fine..
FYI,im using 4-2-1 Extractor.

Nope..no vibrates occured at all..
Just some sort of BROOOOOM sound with something like sand in my exhaust?
The brooom sound is so loud that i need to crank up me speakers volume to 28++ to make it clear.(normal 20 ok edy)
And also,my car performance arent up to its normal.

Eg : normal condition i could reach up to 150kmh..But now barely 130kmh.

Do take note that this only occur when i press the pedal to floor(fully accelerate).
This sound does not occur if i lightly press the pedal.(normal style driving).

Okay..i will test using the newspaper thinggy..
So i guess that sand thinggy is normal eh?Nothing to worry about?

FYI,my mid box/mufflet had just been replaced/ a new one..

So where could that noise come from?
Extractor?

Listen to the sandy sound right?
Thanks mate..will try..