Jack Goff will complete Triple Eight Racing's driver line-up in the 2015 British Touring Car Championship.
The 23-year-old Briton will race alongside former champion Andrew Jordan in a second works-supported MG6 after signing a one-year deal with the team.
"It's a thrill to start the season in the quickest front-wheel drive car on the grid," said Goff. "Obviously as a kid growing up, driving for a works team is the pinnacle.
"I'm chuffed that we're working with Triple Eight and MG, over the course of the past three years they've shown that the MG is a race winner and a championship contender."
Goff made his BTCC debut in 2013 after winning the Clio Cup UK the previous season.
Last year he finished 14th in the standings but he is now aiming to start winning in one of BTCC's top teams.
"This is an important step in my career and I have come here expecting to win races," he added. "I know what it takes to do that, I've shown my ability in the Clio Cup, and now I have a BTCC car and team that will give me a platform to challenge from.
"There's a really good buzz at Triple Eight; you walk around the factory and there are so many trophies and references to winning in the BTCC.
"Add that to having a former BTCC champion in Andrew (Jordan) in the team, it really gives me a lot of confidence for the year ahead."