This twin turbo package using Precision 62mm Turbochargers from RacingSolutions is a bolt on system requiring no internal modifications to the engine and is priced around $40,000.00. Higher end packages are available with additional power that include building the engine and driveline upgrades at around $80,000.00 Take a look at dyno data and video below.
2013 Dodge Viper SRT Gen V RSI Twin Turbo Dyno Sheet Details
Source: RacingSolutions