Haha, the "we've never blown up a car" thing is a common talking point of the vendor posting in this thread.
The N20 is very new and I have yet to see any logs showing ignition timing under stock loads. However, the stock N54 goes all over the place in warm conditions, so I believe even a mild tune should have some form of CPS offsetting (if it's a piggyback) or rewrite IT tables dependent on the level of boost (if it's a flash)
Here's some good reading:
http://www.e90post.com/forums/showthread.php?t=491784