What exhaust parts do I need? 550 Maxim

My bike (550 Maxim) is VERY loud, and i would assume it's because of my exhaust not having any baffles.

I don't know what parts are missing/needed, so any shopping list advice would be very helpful.
I've cleaned and synced the carbs this spring, but I did not do any rejetting. Do you guys recommend I get back in the carbs and swap out the jets? A few threads recommend doing this as the original jets are marginal. Don't know if they've ever been changed or altered.

PO had no carb-to-airbox manifolds (unfiltered intake), and im trying to put it back to stock. I've got the manifolds on both sides of the carbs in place and a good filter.

Looking inside the exhaust pipes, this is what i see.



Looking under the bike, this is the collection box.

 

-What do you mean "original jets are marginal?" Jets don't "wear out" (although they do get chewed up by POs who aren't careful.)

-Collector box looks to be in good shape; looks like you may have a minor exhaust leak where the #1 pipe joins the collector.

-Rejetting shouldn't be necessary as long as you have "re-connected" the airbox and don't mess with the stock pipes and the collector box.

-We need a better pic of your mufflers. Those don't look like stock muflers to begin with; and they definitely appear to have been altered.