Underground Racing is known primarily for their unrivalled twin-turbo kits for Lamborghini
Gallardos, however the Charlotte, North Carolina-based tuning company does much more than just give biturbo steroids to Raging Bulls. They have just released some shots of their latest work-in-progress, a very powerful Audi
R8 GT. The R8 GT V10 Coupe at stock cranks out a very loud 560 horsepower from its 5.2-liter FSI V10 engine.