It is an M6, just look at the cockpit.
However it might be a bit faster than M5 as it is a bit lighter and more sporty shaped.

 

The M5 is actually quickest in the beginning*, but in the end the M6 will be faster.

*According to a magazine

 

You have a point! Have you ever ridden a bike btw?!
I have but not at those speeds. I reached 180 km/h and then backed off since i didn't have the licence yet and had little experience. Then i had a bike accident at low speeds (no protection whatsoever) and then quit the 2 wheels 4 ever but that's another story. From my narrow experience and from what others told me that passed 300km/h on their bikes is that the most feared incident that may happen when ridding at very high speeds is to be forced suddenly to brake hard to avoid an obstacle. Most of the deaths on bikes occur due to that kind of circumstance (ex: car made a U turn without checking the mirrors---biker had too much speed and couldn't brake on time to avoid the collision or biker couldn't brake on time when car in front of him braked at max, or biker couldn't brake on time ao avoid a big hole in the road or whatever). Most of those friends of mine told me that they have never heard or experienced a tire blow on their bikes and are quite confident in their tries. Most of the tires that equipp top model superbikes are made to rezist 300km/h quite effortlessly. Michelin Pilot is a good example if i remember correctly. Indeed there are alot more risks when ridding a bike, ALOT more but hey from what they told me, the bikes are made in such ways that at 300km/h the bikes glues to the road like it is on rails and bare in mind that on a good bike 300km/h is easy to achive.
If smth goes wrong on a bike at 300km/h there's not much you can do to save your ass. But hey what if smth goes wrong in a car at 300km/h. I think in most of the cases your still toasted even with the fact that your protected in a body shell with all sorts of airbags and safety measures. I've hit a tree at 160km/h and i saw what pain is...and nearly died in an accident like that hitting a tree with that speed. At 300km/h it quite doesn't matter what you hit in a car...you are doomed anyway. So in conclusion, even though it's not good to think like that, and it's the best to always be cautious and drive moderately, IF shit happens at 300+km/h in a car or on a bike then only a miracle would save you.
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All what is said... I think You are... well... maybe You don't mean all what You say.

I think that I have test top speed of every thing I have had, but still... No offence!

Skaffa
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What do you mean? Can you be more specific? I can't understand too much from what you say there....
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Sometimes I feel that You are accident to wait happend. I hope I'm wrong.

Skaffa