Built-in intercooling. Intake piping provides ~50% intercooler efficiency. There is no need for the expense, pressure drop, and installation problems associated with a front mounted intercooler.
I wonder how good the throttle response is with 10' of exhaust piping between the head and the turbo, and another 10' of piping between the turbo and the intake manifold? Mmmm... nothing makes a turbo fun like a couple of seconds worth of lag!