 After making the Playoffs in his first appearance, Custer began making a surge at the end of the season including leading the most laps at Chicago and Kansas.Custer missed the Final Four by two spots after racing head to head with Daniel Hemric, the next week, Custer put on a clinic by leading the most laps, winning both stages and en route to his first Xfinity win at the Homestead–Miami Speedway in South Florida.The next year at the fall Texas race, Custer got his second career win when he passed Tyler Reddick on the last lap, clinching his spot in the Championship Four.