Even though these cars are both from Daimler Chrysler, the Viper was
created back when chrysler was on it's own, and by a small team of
desginers led by the one and only Carroll Shelby. The SLR was created
by McLaren. I don't think you could really say the SLR is related to
anything. If you had to, the easiest argument would be the Mclaren F1.
They have similar technolgies (carbon frame and build process, inboard
springs and dampers, yada yada.) I'm fortunate enough to have seen both
in person with their hoods raised and the SLR is light years ahead of
the viper in technology. I'd still take a viper though.