The Ferrari LaFerrari and McLaren P1 may be some of the fastest supercars in the world at the moment, but those automakers have taken the battle to the track with even crazier and more expensive variants. The Ferrari FXX K utilizes a naturally aspirated V12 that's good for 848 hp, while the electric motor puts out another 187 hp for a mind-bending 1,036 hp. The McLaren P1 GTR on the other hand has a heavily tuned 3.8-liter twin-turbo V8 and an electric motor for a whopping total of 986 hp.

Both vehicles are priced similarly at a rumored $3 million and can embarrass other supercars on a track, but which one makes the sweetest music?