We took the muffler off to hoist the engine and change the transmission

Now everything is put back together and I have (what I think) is excessive fumes and noise coming from the port engine.

I open the hatch and everything is perfect, no fumes, smoke or anything out of order

Everything comes out of the back exhaust just above water level

Note the Starboard side is much quieter and no fumes at all

I have no idea of what it should be like as I just bought the boat and can only compare it to the starboard engine

They are crusader 454's

Any advice, knowledge would be appreciated

Should the muffler have water in it?
If so, Was I suppose to put some in before I connected everything back up?
Is there a baffle inside that could be bad?

Thanks
Steve