In the world of motorsports, a million dollar racecar is pretty standard stuff. But one available to the public? That’s probably a McLaren. The British supercar maker has unveiled the predecessor to the iconic P1. The forthcoming Senna is an aerodynamic marvel powered by a 727 horsepower 4-liter V8 and is 640 pounds lighter than the P1. Only 500 Sennas will be produced.