Heffner Performance out in Sarisota Florida has just built a 900 horsepower twin turbo Dodge Viper. Heffner Performance is known for making the fastest Vipers in the world. Heffner is also the only Viper tuner to use an engine management system to regulate the boost and fuel for the twin-turbo set up. So if you want a bullet proof Viper, head on over to Heffner Performance, they are the best!