The Plus, developed by Audi Sport, has 69bhp and 15lb ft more than the standard R8 Spyder V10, giving it a total of 602bhp and 413b ft.
It's also 25kg lighter, thanks to the use of carbonfibre-reinforced plastic on its interior and exterior. The means the Plus weighs 1587kg, which is 167kg more than the Lamborghini Huracán Spyder and 83kg less than the Porsche 911 Turbo.
"For us this is a combination of a super sports car with exclusive open-top driving pleasure," said Audi Sport boss Stephan Winkelmann. "It's something that for us is the best combination you could have in a very exclusive, very fast car.
"We increased the torsional rigidity by 50% in comparison to the predecessor, which is good for handling, acoustic sound and crash safety. This is a car that you can drive at every opportunity."
The Plus's increased power and decreased weight equate to a 0.3sec improvement 0-62mph time and 6mph increase in top speed over the regular V10 Spyder, at 3.3sec and 206mph.
The Plus is marked out by carbonfibre trim across the exterior in place of the standard car's gloss black trim. Its trapezoidal exhausts are also split into four separate pipes, in place of two larger, undivided pipes. The Plus also gets standard bucket seats and ceramic brakes.