If you want to have some cheap noise, unbolt the muffler from behind the converter and start it up. Some engines are not too loud with just the converter. If it isn't too loud, just buy a turn down piece of pipe and your done. If it is too loud, try adding a glasspack, but be sure to use one with a good size diameter. Small diameter pipes are responsible for a lot of that weedeater noise you mentioned.
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