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You can fit a Borla single inlet and dual outlet muffler just after the cat and then run duals out. The Borla has a great sound and you've saved quite a bit of weight from behind the axle.
So you're eliminating 2 mufflers and a resonator for a giant muffler that falls right where the driveshaft is? You might as well save the money and buy some some ARP tips from Kragen.