The 2009 Dodge Viper is available as a 2-door, 2-seat convertible. Starting at $88,755, the 2009 Dodge Viper Convertible is powered by a 8.4L , 10 -cylinder engine mated to a manual transmission that returns an EPA estimated 13-mpg in the city and 22-mpg on the highway. The top of the line 2009DodgeViperCoupe , priced at $ 89,505 , is powered by a 8.4L , 10 - cylinder engine mated to a manual transmission that returns an EPA estimated 13-mpg in the city and 22-mpg on the highway.