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Currently you are able to watch "American Chopper - Season 4" streaming on Discovery+ Amazon Channel, Discovery+.
The Teutuls face new adventures this season a jousting tournament leads to a biker build-off, and old school vs. new school competition comes to a head with a father vs. son competition. Paul Sr. stays young with a visit from the tattoo artists of Miami Ink and Mike and Vin wrap up the season with a trip to Australia as the team creates a theme bike for Russell Crowe.