Heffner Audi R8 Twin Turbo
Heffner Performance has finally finished their R8 Twin-Turbo package, which manages a nice 536 HP at the rear wheels (check out the dyno sheet below.) This is while running on only 6 psi of boost. Heffner promises they are working on an R8 V10 version of the twin-turbo package as well, which should be coming soon.
Take a look at the pictures and video below, and contact Heffner Performance for more information.