[TEXAS MUDSLINGER]

The HMF is just like most aftermarket dirtbike mufflers it has a packing that wears out, and is replaceable, I have heard you can send it back to hmf and have them do it for some $$$ but you can do it yourself by drilling out the rivits on the back cap and putting in regular muffler packing, like you would put in a dirtbike pipe the muffler packing can be purchased at any Honda shop.

 

[TEXAS MUDSLINGER]

Well there will be a different sound once the pipe is broke in, it will be somewhat louder. The life of the packing depends how much you ride and if the packing has got wet multiple times. water will shorten the life of the packing. Als when you drill out the rivets you just replace with new ones, they ar just plain 1/8 aluminum rivets.