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We've seen plenty M3 dyno outputs, including chasis dynos done by the same company on two different production cars which were in the region of ~370-hp at the hubs. That is perfectly reasonable/expected for an engine that is rated at 414hp at the crank. To the best of my recollection, the GTR dyno runs on the other hand were really inconsistent with Nissan's 480 hp rating.
I really doubt that you'll see too much of a variation in power output due to manufacturing variances on production M3s. They must have made a science out of that, and I am sure each engine is being tested before it is dropped into a car to make sure it meets specs. They are not running a bakery over there.
And what exactly BMW or Audi can do to a naturally aspirated engine that is going to increase its power output considerably for launch cars? Not much. The only possibility I can think of is to modify the code to overwrite emissions trade-offs, but I doubt they would. Even if they did, you won't see significant differences. Are you saying the launch cars have different hardware in them? I don't think so. Nissan, on the other hand, can play around with boost and change things significantly.
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