The muffler on my 2001 has an internal rattle.  

I am considering attempting to make an internal repair.  Wondering if anyone has pictures of the internal design, as this may help me make the decision to attempt the repair?

If i cant make the repair i'll spend the money to order a new one (est $600).

A member here and also on PlanetNautique.com goes by JHersey29.  He made a youTube video of the repairs to his muffler.  

Edit to Add ->  https://www.correctcraftfan.com/forum/forum_posts.asp?TID=17967&OB=DESC  and 

https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/29556-muffler-rattle-not-against-the-hull

Basically, he removed the muffler,  used a grinder wheel and cut a square access port in the top of the muffler to see the broken internal baffle.  Did some fiberglass repair internally and then patched over the access hole he created.

The internals are fairly simple. As I recall from 2015.  There is a bulkhead baffle about midway front to back.  The access port was about 8" square or so and was centered over that internal bulkhead.    Maybe you can message JHersey29 for a link to his repair videos.

I found a used muffler and my fiberglass skills are lacking so I never opened up my muffler.  Once out of the boat I could see the baffle had collapsed from the exit hose port.  It would barely rattle if shaken.  While in the boat, my muffler would pillow up when the motor was revved up.

The rubber padding under the muffler had shifted and there was a thin spot on bottom of muffler where it rubbed against the hull.  Pinhole leak.