You'll recall that Audi entered Le Mans with four cars in their inaugural run in 1999, two coupes, two topless. Of course, they didn't look this clean in their final form, but these prototypes were pretty sweet. 

I took these at Audi in Ingolstadt on the Saturday of the race, they had set up a huge video wall for the 24-hour live feed. Overall, the race was pretty disappointing for them (though not as disappointing as it must have been for the flying CLK-GTRs), but I think they got the hang of things, eventually.