Car auction in Ironwood. A nostalgic Sam considers bidding on her old car. Marcel convinces his dad, Wade, to make his famous chili. Logan takes Caitlyn's advice and starts a car restoration side gig. Zac has a secret street race. And realizing everyone else has a spot, Caitlyn finds hers.

With only three weeks until Zac's race with Harris, the crew works overtime to finish the UNB10 car. Zac's confidence grows with Ray's guidance. Caitlyn and Curtis discover a possible clue to Christian Maddox's whereabouts. Logan discovers who Zac's been training with. Harris faces a new challenge on his mom's birthday memorial. Curtis takes Brooke for a ride on his bike.