The 1999 Dodge Viper is available as a 2-door, 2-seat convertible. Starting at $68,225, the 1999 Dodge Viper Coupe is powered by a 8.0L , 10 -cylinder engine mated to a manual transmission that returns an EPA estimated 12-mpg in the city and 21-mpg on the highway. The top of the line 1999DodgeViperRoadster , priced at $ 65,725 , is powered by a 8.0L , 10 - cylinder engine mated to a manual transmission that returns an EPA estimated 12-mpg in the city and 21-mpg on the highway.