Tuning firm, Hefner, has developed a twin turbo system for the Audi R8! Preliminary results are at 536 hp at the wheels, a 183 hp improvement over the stock V8 model. The car's currently in development and pushes a modest 6 PSI of pressure from the turbos and while running on 92 octane. There are rumors that Hefner is trying to push the R8 to 620 hp, too.
