New Audi R8 V10 to have 520-540bhp engine

With all the excitment about the GTR and GM's latest ZR-1 Corvette only beating the GTR by 3.1 seconds with 140 more HP. Audi is about to unveil a monster on the Nurburgring.
With the current RS6 Twinturbo V10 version running 550bhp, the highly tuned NA V10 for the R8 will have similiar specs. Audi engineers have already tested the prototypes earlier with one of them catching fire due to a faulty gas line. The V10 is capable of 565bhp but is sure to be tuned less as reported.