Do you plan on selling the car? You can always just replace the muffler because that would be a lot easier. Just go to a junkyard or use car-parts.com and weld on a stock muffler. I had a 92-95 hatch and I threw away my stock muffler after I got my HKS Hiper. It might be a lot easier than searching for a whole OEM catback (which is probably really rusted by now anyways).