When it comes to endurance racing, Corvette has been the benchmark of success for nearly 15 years, says Jim Campbell, U.S. vice president, Performance Vehicles and Motorsports.
You're selected to compete in the fictional IMSA Corvette Championship: 6 multiclass wheel to wheel races across the US, from March to August, 240km each, against the best Chevrolet drivers. The offer lets you race in the Prototype or the GTE class, it's up to you what type of challenge are you looking for.
It's a working championship without the need of ANY paid DLC from Kunos, you just need to download the missing tracks. Any further installation info it's into the README file.