[FIRE]

According Audi themself:

Chassis	Built	Races	Victories	Comment
R8-401	1999	0	0	Completed its roll-out on 23 December 1999 and subsequently served as a test car for Audi Sport. Remains in possession of Audi.
R8-402	2000	2	1	Race winning car at the 12 hour race at Sebring in 2000, and was, as a result, the first R8 to win a race. Serves as a show car today with "crocodile" bodywork.
R8-403	2000	19	7	The 2000 ALMS championship winning car, which started as a "crocodile" at the finale at Adelaide. Was sold to Stefan Johansson's team and raced for another year.
R8-404	2000	1	1	The 24 Hours of Le Mans race winning car in 2000. Was only raced once, has been on display at the Audi museum mobile in Ingolstadt since then.
R8-405	2000	18	2	Frank Biela and Emanuele Pirro's race car at the ALMS race which followed Le Mans. Was bought by Champion Racing in 2001 and entered in the ALMS, was loaned to the factory team for a final time in 2002 for the race at Sears Point.
R8-406	2000	0	0	Show car. Was never raced.
R8-501	2001	1	1	First of the second generation R8 cars. Audi Sport test car, which only raced at the ALMS race at Jarama (TFSI engine debut).
R8-502	2001	5	3	Won the first three races of the 2001 season (including Sebring) before being sold to Team Goh in Japan, which entered the R8 in two races (Le Mans and Suzuka) during the 2002 season.
R8-503	2001	11	4	Frank Biela and Emanuele Pirro's 2001 ALMS race car and the 2001 24 Hours of Le Mans race winning car.
R8-504	2001	0	0	Was earmarked as race car for the 24 Hours of Le Mans in 2001. Michele Alboreto crashed with this R8 whilst testing at the Eurospeedway.
R8-505	2001	47	15	The R8 with the most races and wins under its belt. Dindo Capello and Tom Kristensen's race car in the 2001 ALMS, which was subsequently run by Team ADT Champion Racing for four years in the American Le Mans Series. ALMS winner in 2004.
R8-601	2002	10	4	2002 Le Mans 24 hour race winning car, and Frank Biela and Emanuele Pirro's race car in the 2002 ALMS. Loaned to the museum in Le Mans by Audi in 2004 - where it can be seen today.
R8-602	2002	18	8	Dindo Capello and Tom Kristensen's race car in the 2002 ALMS, with which Kristensen won the title. Was transferred to Team Goh in 2003. Won Le Mans in 2004.
R8-603	2002	13	4	Served as third car in Le Mans 2002, was subsuquently bought by Audi UK, entered at Le Mans in 2003 and by Team Veloqx at Le Mans and in the LMES in 2004.
R8-604	2002	15	6	Was rebuilt in winter 2002/2003 by Team Joest and raced in the 2003 ALMS. Was transferred to Sam Li (Team Veloqx) in 2004 and won the LMES. Scored the 50th victory for an Audi R8 at Spa 2004.
R8-605	2002	16	7	The last R8 built, which only made its race debut at the end of 2004. Team ADT Champion Racing won the 24 Hours of Le Mans and the American Le Mans Series with it during the 2005 season. Was also in action on the "Farewell Tour" during the 2006 season.

Source: Audi R8 - Born to win by Thomas Voigt/Audi AG