Click above for more high-res shots of the Audi R8 The Audi R8 has supercar looks and red-hot demand, so if you want to own the stunning German two-seater, you'd best get to the back of the line. Buyers of the mid-engine Audi have picked up every model that will be made for months, which tells us what we already knew: the R8 is a legitimate smash hit. Oddly, Audi isn't specifying how many R8s it has sold since the vehicle's introduction, and it's likely the German automaker won't go out of its way to ramp up production and risk ruining the all-wheel-drive supercar's buzz-factor.It's no surprise that the R8 is so successful on the sales floor, but the downside is that the vehicle's sustained popularity is keeping higher performance editions off the market. If a 420-hp 4.2L powerplant can take you to 60 mph in 4.4 seconds, just imagine what a 580-hp twin-turbo V10 will do on dry pavement.