The guys at OCC go to drag racing school in New Jersey to prepare to build a drag bike for NAPA. Junior designs a bike unlike any other, as it'll have a straight speed of 140 mph, and will be used in actual races on the quarter mile drag track.

Junior and Senior join forces to build a bike that will be auctioned off to benefit the families of wounded and fallen troops. Their father-son rivalry emerges as Senior builds an old school bike and Junior builds a more modern bike.