All 2st Silencer packing

You guys and girls that have repacked your silencers, which end burns out first? i took the input end off the stock silencer on my 11 wr300 (approx 100 hours) and I could see that end off the packing and it looked just fine. I didn't look up how to get it a part beforehand so I didn't know I was suppose to drill out the rivets. Since the inlet side of the packing looked good I put it back together. Does the exit side burn out first? It just seems a little loud but I don't want to fight that o-ring and drill out the rivets just to find out that everything is still OK

mine looked fine at that amount of time too but even though it looks ok it gets oiled & carboned up which reduces its effectiveness im told. wont really burn out like a 4T, maybe blow out if loose packing used but 2T don't get hot enough to burn. perforated core may get crabon up & reduce sound dampening & performance somewhat. they are packed well from the factory with steel wool wrapped around core first then sheet type packing. youll notice a bit of difference sound wise, just dulls it a little