I Love my magnaflow but wouldn't mind a resonator with no cats being it's a little raspy from 1600-2100rpm. I wouldn't go with bigger than a 18" case though or it will be real loud. Texas speed performance sells y-pipes with cats that are direct bolt up just a little high in price.
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The longer the case on a Magnaflow, the quieter it'll be. I originally had a round 14", it had some drone. I went to the 22" 5x11" case and it doesn't drone. I don't have a 6.0, yet. Once the 5.3 gives up (in ~100k miles I hope) I will.
