rear mounting twin turbos

I saw a 2009 Hemi Challenger at a local car show last summer. It had twin turbos mounted in the rear. I didn`t see exactly how it was plumbed but I saw his time slips, low 10 second 1/4 mile times. It was one bad *** Challenger, and at the end of race day while all of the other guys were trailering their cars, he changed out his rear wheels, rolled up the windows, turned on the A/C, popped in a CD, and away he drove. If you do this mod right, it can be fantastic.