2nd through 4th gear run on a Heffner Twin Turbo Audi R8. This car is making 6 psi on stock engine internals and makes around 620 horsepower at the flywheel.
Lamborghini, Heffner, Turbo, Twin Turbo, Audi, R8, Gallardo, Porsche, Ferrari, GTR, Ford GT, Honda, Nissan, Murcielago