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Borle Turbo Pro XS make the most power/torque especially down low(as tested by Rick Anderson) and have no drone. Borla's are more expensive but are worth it. Enjoy.
There is a guy selling a Borla Catback here in Charlotte. So close to mustang week I think ill hold off and see if I can get a great deal on a new system while im at the beach. Hopefully I get some new toys to play with before I head home.
One pair of 40 series Flowmasters are probably delta flow and the other is the original 40. Either way, I'd replace the chambered mufflers with something else like Dynomax or Magnaflow.
My wife often asks me why I don't turn on the stereo and listen to music. I always reply "I am listening to music" then I gas it and set her hear the rumble of my exhausts. It's my favorite music. (NO Drone)