![::](http://www.engineswapdepot.com/wp-content/uploads/2015/10/Hallenborg-Twin-turbo-LSx-powered-Orange-Viper-Replica-01-1024x683.jpg)
Viper Replica with a Twin-turbo LSx
I came across this project over a year ago while researching for another article. I never planned on writing about it since it was completed many years ago but I saw it making the rounds again on social networks with incorrect information so maybe this will help a little.
Although this is an amazing project it is not an authentic Dodge Viper. It is an aftermarket fiberglass body over a Corvette C4 chassis. The project was built by Swedish builder Jonas Hallenborg. The engine has gone through a few iterations but the most recent is a twin-turbocharged 7.0 L LSx which produces 1048 horsepower to the wheels on 21 psi of boost and E85 fuel. You can find more photos and details of the build at the project’s homepage.
![Hallenborg Twin-turbo 7.0 L LSx powered Orange Viper Replica](http://www.engineswapdepot.com/wp-content/uploads/2015/10/Hallenborg-Twin-turbo-LSx-powered-Orange-Viper-Replica-11-150x150.jpg)
![Hallenborg Twin-turbo 7.0 L LSx powered Orange Viper Replica](http://www.engineswapdepot.com/wp-content/uploads/2015/10/Hallenborg-Twin-turbo-LSx-powered-Orange-Viper-Replica-10-150x150.jpg)
![Hallenborg Twin-turbo 7.0 L LSx powered Orange Viper Replica](http://www.engineswapdepot.com/wp-content/uploads/2015/10/Hallenborg-Twin-turbo-LSx-powered-Orange-Viper-Replica-09-150x150.jpg)
![Hallenborg Twin-turbo 7.0 L LSx powered Orange Viper Replica](http://www.engineswapdepot.com/wp-content/uploads/2015/10/Hallenborg-Twin-turbo-LSx-powered-Orange-Viper-Replica-08-150x150.jpg)
![Hallenborg Twin-turbo 7.0 L LSx powered Orange Viper Replica](http://www.engineswapdepot.com/wp-content/uploads/2015/10/Hallenborg-Twin-turbo-LSx-powered-Orange-Viper-Replica-07-150x150.jpg)
![Hallenborg Twin-turbo 7.0 L LSx powered Orange Viper Replica](http://www.engineswapdepot.com/wp-content/uploads/2015/10/Hallenborg-Twin-turbo-LSx-powered-Orange-Viper-Replica-06-150x150.jpg)
The first video shows the car running 1.0 bar (14.5 psi) and producing 770 whp while the second is set at 1.5 bar (21.7 psi) and producing 1048 whp.
Source: Hallenborg.se and photos by Dick Petersson via LS1.com