The Dodge Viper underwent a major redesign in 2003, courtesy of DaimlerChrysler's Street and Racing Technology group. The new Viper SRT-10, which replaced both the GTS and the RT/10 was heavily restyled with sharp, angled bodywork. The engine's displacement was increased to 505 cu in (8.3 L)[8] which, with other upgrades, increased output to 500 bhp (370 kW) and 525 lb·ft (712 N·m). Despite the power increases, engine weight was reduced to about 500 lb (230 kg). The chassis was also improved, becoming more rigid and weighing approximately 80 lb (36 kg) less than the previous model. An even lighter and stronger chassis was planned, but was abandoned because of cost (parts from the planned suspension were used in the Hennessey Viper Venom 1000 Twin Turbo.) The initial model was a convertible. In 2004 Dodge introduced a limited-edition Mamba package; Mamba-edition cars featured black interiors, with red stitching and trim and price increased by about MSRP US$3000. 200 Mambas were produced.
The Viper SRT-10 Coupe was introduced at the 2005 Detroit Auto Show as a 2006 model. It shares many of its body panels with the convertible, but takes its side and rear styling from the Competition Coupe. The coupe looks much like the previous Viper GTS and retains the "double-bubble" roof shape of the original along with the original GTS's tail lights, as well as offering the original GTS Blue with white stripes paint scheme on the initial run of First Edition cars like the original Viper coupe. The engine is SAE-certified to produce 510 bhp (380 kW) and 535 lb·ft (725 N·m). Unlike the original coupe, the chassis was not modified. This makes the coupe heavier than the convertible, and thus slightly slower to accelerate. Handling and high-speed performance are improved by the coupe's stiffer frame, reduced drag, and increased downforce.
No 2007 model Vipers were produced; instead, Chrysler extended production of the 2006 model while preparing the updated 2008 model.
