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skrif you read the d1gp rules, the cars must be built for street use. this means no tube chassis anywhere, (only roll cages are acceptable), and a cat converter must be installed.
This is only a guess, but I would assume that by the looks of that viper, it seems like that car was built for American GT racing. I could be wrong.
Even if that is the case......why was it allowed to compete for a year or two?