The 2001 Viper RT/10 roadster has been somewhat refined, and is a little less unruly than its predecessors. With the addition of power side windows, upgraded interior appointments and adjustable pedals, the latest RT/10 still won't be mistaken for some super-sophisticated European machinery, and just as well. With outlandish styling and 450 hp from its 8.0-liter V10, the Viper RT/10, the latest and last of the classic original Viper model, continues to be a very exciting sports car. Although supplanted by the latest Viper SRT-10 model, the RT/10 is the one that will always be known as a Viper.