Euro Tune?
 

What exactly is a Euro Tune for the SMG, and what does it do compared to the "American" version? What are the differences? Benefits?

Just do a search for SMG III. I just had it done on mine. I can't tell you all the specifics of what it does, because I honestly don't have a clue, but it shifts much more smoothly and predictably. You also get the (ever popular) higher Euro launch control specs.