After winning the 1998 Le Mans 24 hours, Porsche begin work on a new open-top Le Mans Prototype that was to be raced in 2000 after a 1 year sabbatical. But that never happened. Many of the 9R3's details have never been officially released from Porsche but from leaks. A major point is regarding the car's engine. Instead of Porsche's fabled turbocharged flat-sixes being used, the 9R3 is powered by a naturally aspirated V10. The V10 was originally designed as a 3.5 liter Formula 1 unit for the Footwork team in the early 90s but enlarged to 5.5 liters for endurance racing. Both the tub and body panels was produced by Lola Composites for Porsche. The project was cancelled in the middle of 1999, shortly before the car was completed. But near the end of the year, Porsche completed the 9R3 for a private test at Weissach where test drivers Allan McNish and Bob Wollek gave positive remarks for the car.