Make sure to select a diverter that fits the muffler sungly. Use as many zip-ties as possible. If you do decide to "Pin" it in place with a small sheet metal screw, before you drill the pilot hole for the screw, ball up some tissue or paper tower and insert it into the muffler extension just beyond the screw location. After you drill, when you remove the paper wad, you will also remove the metal drilling's/fragments so they cant get scavenged back into the engine. If the muffler is OFF the engine, then of course, you can remove the debris with compressed air.