During last weekend SCC500 Rolling50 1000 these guys filmed this insane loud BMW M5 F10 with a straight pipe exhaust system. It is modified to 720HP and fitted with Ferrada Wheels.
The video shows you the cold engine sounds, revs, acceleration and drag racing against other supercars. Best Vmax after 1000 meter (rolling start of 50 km/h): 258.57 km/h. I hope you enjoy the video.