NASCAR is mandating a new right-side rear-window air deflector after Corey LaJoie‘s car flipped in the air during the Michigan Cup Series race on Monday. The mandate will begin Saturday when the drivers compete in the Coke Zero Sugar 400 at Daytona International Speedway. NASCAR said, “Following wind-tunnel testing this week, the added component to the Next Gen car increases the liftoff speed of the car in the early part of the spin, making it less likely get airborne.” The organization will supply the part and will match what is currently on the left-side rear window. LaJoie’s No. 7 car flipp…