(1 liter of fuel or tyre change is a must)
On the 2nd of July 2015, IMSA announced the base regulations for its then un-named new for 2017 Prototype class of the WeatherTech Sportscar Championship, which would succeed and replace the Gen 3 Daytona Prototypes, and Le Mans Prototype LMP2 class cars, which would become obsolete due to new global regulations on the LMP2 category. These base regulations would spell out the restricted areas, where custom manufacturer bodywork was disallowed, and the base prototype's parts would be needed to be used. The main restricted areas would be the rear wing, rear wing mount(s), and engine cover fin, in addition to the bottom of the car, the splitter, floor, and diffuser. In addition, a control zone for the splitter was defined, to prevent splitter modifications behind the approximate front axle centerline. Restrictions at the front of the bodywork would also prohibit manufacturers from styling the outer regions of the nose, the area traditionally reserved for dive planes on a prototype. Additional restrictions also bar development in the region directly behind the front tires of the car, while the diffuser section located aft of the rear tire was also prohibited to be developed. In opened areas for development, the creation of Wing Profiles was also prohibited.