I have a vw with their 2.0t direct injected turbo engine and it can be loud on startup and sound like a diesel with lots of clatter but it goes away quickly. Loud starts seem to be a characteristic of this generation of di engines. My brothers 06 gti is the same. But I did notice that the sonata seems rougher and more clattery than any other di engine vie experienced. But it isn't bad try starting a typical dieselSister in laws Pontiac Solstice 2.0, probably the first direct injection turbo oout there, also sounds like crap on start up.
So maybe the engineers aren't making it up.
Anybody heard if Ford's direct injection is also loud.