Fellas, the gas tank is directly below the rear seat, forward the rear axle. What would be in the way is the depth of the spare tire well/bottom of the trunk. I for one kinda dig the look of a car without seeing the tailpipes, ala 87-93 Mustang GT's, like my GT conv. Maybe one of these days I'll fill the holes in the back of my SVT rear bumper (both exhaust and center section) and have the tailpipe turned down out of the mufflers. Wouldnt that be trick?
As far as a single center exit, I for one dont think it will look good. Just IMO.