I have learned a lot about trq/hp/wt reading comments in this thread!
To be honest, I personally don't believe in numbers on a spec sheet, but in the final/finished product.
For example, every time a new Audi is released, I get flattered with its specs and performance on paper.. And although I wouldn't buy one, I have test driven a couple lately (rs5 and ttrs) only to find out that the finished product/all parts put together IMO is not a translation of the promise on paper. I would say its always better to understate (hp claim) than to disappoint!
BMW M has never failed to impress and develop best in class cars within their segments, so I'm just waiting impatiently for the upcoming M-onster to hit the showrooms.