It doesn’t work that way, what they do actually is to graft the tunica so it is longer. An article about this technique was described in this very same trhead.
Beside that, read this warning
After Enlargement Surgery pic
The big penis and mens' sexual health source, increasing penis size around the world.
Began December 2009 at 5 7/8" length and 5" girth.
As of December 5th 2012 7 3/8" BPEL and 6 1/8" base girth.
Going for the magic 8"x6"