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I was taking apart my 2004 coupe ex to do some rattle hunting and in the b pillar under the seatbelt assembly I see what looks like a black trash bag sticking out. I pull that out and behind it at first I thought someone stashed their weed and forgot about it lol. I see a big clear bag of what seems to be jute.

I'm assuming this is just factory's attempt at sound treatment? Just seeing if anyone has experience with this, did you remove it? I kinda wanna replace it with something less.. ghetto. I don't want these bags to start crinkling when the bass hits..

Some ideas I had are like filling it up with expanding foam or just some foam pieces, maybe some overkill or luxury liner pro? I dunno, thanks.

 
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I used to find black plastic bags of (stuff) in Ranger trucks below the jump seats, they were the same thing.