If you are the owner of an early GT car and could provide information on your rear exhaust mounting points it would help to establish the introduction period of the straight through duals. Please provide your scheduled build date and whether or not you have the CENTER or REAR mounting point for the resontator hangers in the back.
CENTER mounts are in the center of the rear frame rail and DO NOT have inner reinforcment inside the frame rail.
REAR mounts are in the rear third of the rear frame rail and DO have the inner reinforcement inside the frame rail.
Thanks.