Cadillac will return to prototype racing after a 14-year absence. Cadillac President Johan de Nysschen has confirmed that three Cadillac Daytona Prototype international (DPi) race cars will compete in the full 2017 IMSA WeatherTech SportsCar Championship Prototype (P) class. The first race will be the 55th Rolex 24 At Daytona on Jan. 28-29, 2017. In …