I'd install the H-pipe and maybe get some mufflers other than stock. I don't know what sounds good on a new-edge v6 though
try mustangforums.com, they are pretty knowledgeable over there regarding new-edges in general
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2007 Ford Mustang GT/CS Manual
K&N CAI
Flowmaster Super 44 Axle-backs
Bamachips 87 Performance / 89 Torque / 93 Race Tune