Thursday

Gas Monkey Garage signs up for the Redbull Flugtag -- and Aaron is in charge of making and piloting their flying craft. But building something with wings instead of wheels proves to be a challenge, even for this master mechanic. Plus, when a rare Dodge Wayfarer rolls in, Richard’s hopes for a fast flip get stalled when the engine refuses to start.

Ashley and Les hit the road to get first dibs on a huge estate sale, but will they find treasure or fool's gold? Seth takes a custom Corvette go-kart for a spin but pumps the brakes on the deal when the 12-year-old owner tries to play hardball. Plus, what price is Karen willing to pay to get her hands on a piece of '70s movie memorabilia?

When Les gets a last-minute invite to give a lecture at a local business school, Seth takes the pressure off by writing his speech. Can Les pull it off? Or will Seth's words translate into a disaster? Plus, Ashley and Bobby J go to war over a collection of Nerf guns, and negotiations hit a fever pitch when a wannabe ventriloquist walks in with a dummy that bears a striking resemblance to one of the Golds.

Les questions Ashley's management skills after two employees get into a fight on the shop floor. Will Ashley succeed as a peacemaker or create an even bigger problem? Meanwhile, Seth stumbles upon what could possibly be the biggest memorabilia deal the store has ever seen, but will it tank?

Les hatches a secret plan to put his employees to the test, but how will Seth, Ashley and Karen react when they find out they've also been put under the microscope? Plus, a man in search of the perfect engagement ring ends up giving everyone road rage when he blocks the store parking lot with his truck

Ron and Bobby throw down in the middle of a scrap yard.

Emotions run high when Ronnie goes head-to-head with a former bully.