Porsche LMP2000
 The Porsche LMP2000 (also known as the Porsche 9R3) was a Le Mans Prototype racing car that was developed between 1998 and 2000 but never raced. One car was built and it was designed around a modified version of Porsche's 3.5-litre V10 engine that was originally designed for Formula 1 in 1992. The project was cancelled before the car was built leading to various rumours about the reason for its demise.