I got with Eric of Gardner Exhaust and got him to reproduce the factory exhaust. They could do everything except the rear tongue hangers, GM would not allow him to reproduce the hangers. The new system is perfect, wrinkle bends and all.
I have an 87 GN completely stock (33,000 miles) except for the exhaust, it eroded from moisture just sitting up. All I need is the hangers to install on the car. Will post pics when it is done. Here is a couple of pics of the new exhaust.
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