IMSA president John Doonan joins RACER's Marshall Pruett and DailySportsCar's Graham Goodwin to discuss the series' North American leadership role with sustainability and technology in motor racing, the explosion of entries for the Rolex 24 At Daytona, and more before the rest of the day's testing action is discussed.

The RACER Channel catches up with Porsche's Mark Webber who speaks on Formula 1, sports cars, and his favorite part of the COTA circuit."Formula 1 from about 2009 to '13 was a bit of a dinosaur, the engine was very old, that's why they had the engine freeze like that,...