911 x51 and x50
 

The 911 Coupe can come with the x51 engine upgrade package bringing the the 0-60 down to 4.4, likewise the turbo has the x50 option taking it down to a time of 3.6 for the 0-60. I looked for more stats as I was trying to rationalize the extra 20k that porsche wants for the stock turbo over the x51 911. The stock turbo has a time of 4.2. I realize you can't base a car on the 0-60 time, I googled for more data but not much other than the 0-60 came up. Is porsche charging 20k more than the x51 for simply the turbo, the name, and .2 seconds performance. Something else must be coming in the deal?