[Masteryota]

As for gutting the muffler, find the seam where the factory welded the end cap on the cylinder, towards the exit of the muffler, and cut there. With the cap off, remove everything inside, then clean up the cuts on the cap and weld it back on the cylinder. With that, you might want to weld up the drilled holes, and take a 1.5" hole saw to the tip and punch out that tiny tail pipe. This is the most common way to do it.