Fast6 (Phat6...?
)
I would bet that is a greymarket import as you have the german instrumentation and bumpers, sweet.
As for the hp, I'm sure it is fast, but butt-dynos are unreliable.
The 6 was a relatively light car for its size and they are fast even as a US M6 version. Just for shits and giggles, if your local BMWCCA chapter ever has a dyno evening at a local tuner, you should bring it over and get the real figures. Might be more, might be less then you think
Carl