The trainer Heffner Performance showed a video of the result of the upgrade that took place in an Audi R8. With the addition of two turbochargers and several new components, the 4.2 V8 engine of the German sports started to produce 630 horsepower, versus 420 hp original. The security enhancement is of one year or 19,200 km.
For those who have the configuration of the V10 5.2 FSI Sport, the Heffner also provides an upgrade with two supercharged Garret GT35R for the model. Working with only 0.4 bar pressure, the improvement makes the model go to send 725 horsepower to the wheels of the model, which means around 840 hp engine.
Check out the images of models on the link "Pictures" above and the video of the R8 V8 biturbo below.