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jshillin,
That is an easy fix, i had the same issue with my single exhaust. Bought the magnaflow dual exhaust, cut the hole out, molded it with a heat gun. Did not remove or replace the rear valence. If you get about 6" away you can start to see the imperfections. And you need to put at least 2500 to 3000 miles on it before the exhaust starts to sound better. I was very disappointed the way mine sounded at first, but now it has a nice low humm.