Split Shift Racing is a cancelled game for XBOX 360 and PlayStation 3 that was developed by THQ Digital Studios UK / Juice Games. It never made it far, and not much is known about it. In 2020, a developer kit from THQ was found to have a deleted build of this game. As of now, it's incomplete, but it may be fully recovered in the future.
Judging by information found inside the files recovered so far it is based on the Juiced 2 engine/source.