Does anyone have any knowledge of the exhaust system on a 95 355 Aft?

Motors - 454 Crusaders

When I start the port motor for the first time after a period of "rest", the muffler is clearly empty. It takes about a minute to completely fill up and start doing it's job. When I shut the motor off, water continues to drain from the exhaust for maybe 5 minutes before stopping.
To me it sounds like even when the muffler is full that the port motor is louder than the starboard. The starboard starts a little loud, but then quickly goes almost silent.


My guess is something is broken inside the muffler. I'm wondering if it's worth cutting open to repair, or just buy a new one... Not sure what parts are actually in the muffler, maybe some form of flap that broke/cracked. which is question 2.. any idea where to get a new muffler? I'm thinking it's a Centek unit maybe? No stickers or numbers on it.

Just for clarification, there's no exhaust leak in the bilge or in the boat. The problem is internal to the muffler.
Plenty of water is flowing through the exhaust. The impeller is recent and flows strong and equal to the starboard side.

Oh and my wife says not to fix it, she likes the noise! haha! I'd like to try to improve it if posssible

Thoughts/Ideas?

Thanks