We're a bit skeptical about this video, and it's safe to assume that opinions will be divided. The video is a simple enough idea, there's a BMW F10 M5 racing against a Ferrari FF, and the M5 turns out to be faster. This is hardly an impossible feat for a tuner, but the claim is that the BMW is stock. Now, the car is down 100 horsepower compared to the Ferrari, it weighs more and has a bit less torque. So how is this possible? Well, that's sort of hard to figure out.

The video description says the M5 is running on 98 octane fuel, but that's not going to make quite that big a difference. So what's going on here, do you think someone is lying?