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As the stock box is quite big and I assume it will be welded shut, the best bet would be stainless steel exhaust packing. I agree that it would be very expensive. The next best would be ceramic exhaust packing. Fibreglass would be my last choice as it will eventually blow out and this being welded shut doesn't lend itself to an easy re-pack that a riveted motorcycle muffler does.
Do it right or do it again comes to mind. Depending on mileage I would have to re-pack my bikes pipes every 2-3 years to keep the sound reasonable with fibreglass muffler packing...
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