Tar removal???
 

i have an 84 with stripped interior, im currently at 2100lbs and wanna get lighter so im wanting to remove the tar sound deadening, so does this serve any structural purpose or is it all for noise reduction.

if its just for noise i will be removing it with dry ice as i heard this is the most effective way.

Only for noise reduction. Its probably a good thing to remove it water can get under it. You are correct break up some dry ice let it sit you'll start to hear it pop and just use a scraper and a dead blow comes out easy