2002 V6 mustang Exhaust question?

I have decided to get Magnaflow exhaust but I am uncertain which to get. I have the h pipe for the true duals and a GT rear bumper for the new exhaust system to go in. I was considering the Magnaflow Catback with a chambered muffler or Magnaflow Magnapack with straight-thru muffler. Which of these two will be the loudest(similar to a Cobra) and produce the most horsepower when combined with a CAI, throttle body, and BBK shorty headers. If you have any reccomendations, I would really appreciate your advice. Thank you