Or Someone is willing to do this type of mod just for pure sound . Since upgrading a axle back muffler doesn't produce any horses for the penny.
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Cool!
Some may want to do similar mods to their bikes:
https://www.youtube.com/watch?v=CDafMzo4HO8
Please note that this doesn't add any actual horsepower but the deep, masculine exhaust note will sound more powerful and bystanders will think it fast. ;-)