diveplane, this sounds very close to the real thing, unfortunately it's a 406 and the current engine is known as a 408B (more thrust, more whine). This is one subject on this forum that I feel I'm qualified to discuss. PM me if you need/want any details.
--forgot to mention that the 406 was phased out sometime around 2002ish. It sounded excellent though and pretty accurate to what the real one sounded like. Very impressed and the cockpit view was pretty spot on! Excited to see the real deal.