The locktite will liquefy at engine headbolt temp.
Use nylock bolts instead.
The lawn mower muffler that sick bike parts sells helps, or just go to ACE Hardware and pick up the biggest lawnmower muffler. I believe it is about six inches long.
I make my exhaust out of old handlebars and rings made of seatpost material.. All that I use is ine of those mufflers it is super quiet, With almost no restriction.
It would really quiet down the stock muffler.
I do not know what type of exhaust you are referring to.