I knew someone sold the replacement syetem for the T/A & AAR's just took a little longer to find than I thought. Accurate Exhaust makes them. they look like this:
http://www.accurateltd.com/AARTA-Complete-Exhaust-System_p_28-187.html#
You may want to look into the mufflers used on a Challenger T/A. Flow is U shaped and inlet outlet are on the same side to alow a gentle curve to exit in front of the rear tires,