i need a muffler!

#2
just a regular small engine muffler works pretty good if it's not burnt out, or sometimes you can rig a motorcycle pipe on them and that works pretty good.. Usually takes a fairly small motorcycle for the pipe to be the basic right size and not 2 feet longer than your mini bike.
 
#6
Yeah if you just have a strait pipe they are pretty loud. If you already have a threaded pipe, you should be able to just buy a round mushroom style small engine muffler to screw on the end of your pipe.
 
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