Umm...both of those cars are modified and not stock.
A Viper GTS-R won the GTS class in the 1998 and 1999 24 Hours of Le Mans and took the overall victory at the 1999 24 Hours of Daytona.
Have you driven a Duesenberg and were disappointed by it?
check the link
Duesenberg
Have you driven the new Corvette Z06 and were disappointed by it?
The official time for the new Corvette Z06 at the Nurburgring is 7:43.
http://www.nuerburgring.de/
New Corvette Z06
Have you driven the Panoz Esperante and were disappointed by it?
Panoz Esperante
Have you driven the Saleen S7 and were disappointed by it?
Saleen S7