My father purchased a mini pocket rocket brand a4 miniquad for my son a few years ago and it's always been so ungodly loud we've hardly ever ridden it. Last night I was repacking the can on the boy's ktm pro senior and decided to open the silencer on the quad. Inside there is not only no packing material, but there isn't even a drilled out tube between the expansion chamber side and endbell side, just an empty can!!!! Is this purely decorative or a manufacturing mistake? The question I really need answered is can I simply fill the can with packing material, or will it plug up with 2 stroke oil and cause damage? I filled it with fmf repack material last night and it does run well and is at an acceptible noise level. Thanks for any help or advice!