My friend found the problem with the exhaust loud noise issue. It turns out the sleeve goes inside the exhaust pipe that connects to the middle/front muffler was cracked and some of the areas of the sleeve had some holes as well. Both mufflers are fine. He removed the sleeve by prying with the screwdriver, hammer, and plier. I bought a new sleeve that matches the old one along with new clamp. He also has to weld the sleeve into the hole of the front/middle muffler. Also, the exhaust pipe that is connected to the rear muffler was bent due to dragging. He had to bend back to the original shape so the sleeve will go inside the middle/front muffler. Total cost was much much less. The only replacement was the sleeve and new clamp.