The TT Corvettes out there have been seemingly running the piping in conjunction with the sideskirts ll down the body of the car. They look sreally good and perform very well also.

A rear mount turbo setup on a crossfire would work, but you would most liely have to tub out some of the rear wheel wells to get the piping to stick close to the sides as well as create a true dual exhaust with two mufflers (if you have them at all), for the turbos...seems to me running a TT setup without a true dual exhaust doesn't seem very efficient to me.