740 hp
its costs around £73,000 new but if you buy a used one it is about £25,000.
The BMW M5(also the M6) has a 5.0 liter V10 which produces 507 bhp.
No, the two have the same engine but the M6 weights about 500kg lighter. But that only matters in a straight line. In a corner, the M5 is simply too long to have a good turning feel.
Gasoline.