x-pipe and exit in front of rear tires?

About 4 years ago Mopar Action did a Bold Beeper series on a Road Runner project car.

496 Barton motor, TTI 3 Inch pipes with an H-Pipe.
Made 435 hp at the tires.
They disconnected the center section at the headers and threw in the new TTI Nascar style X-Pipe and guess what happened??

HP up 24 to 459 and picked up 16ft/lbs of torque with a simple bolt in swap.

Read it and weep:
http://www.allpar.com/history/mopar/x-pipes.html