Nick McHugh and Rickard Hugg scored just over a minute apart in first and the Rangers went on to beat Flint 7-2.
McHugh had two goals and an assist in the win. Greg Meireles scored and set up three of Kitchener's goals.
Jonathan Yantsis' goal just 38 seconds into the second period would stand as the game winner.
Lucas Pfeil stopped 36 shots for the win.