I am contemplating either an exhaust swap... Maybe the Flowmaster Outlaw Axle-Back Exhaust
Or doing a muffler delete like this:
Or both the resonator and muffler delete:
However, I keep getting mixed answers regarding resonator and muffler delete. Some say I will lose HP/Torque and others say you gain HP/Torque.

Another individual directed me to this: http://www.doityourself.com/stry/per...pipe-exhaust#b

So with the Ecoboost Mustang and considering it is turbo... would I be losing performance by deleting the resonator and muffler and adding a 3" straight pipe? Or if I kept the resonator, deleted the muffler and added the 3" straight pipe would it retain performance?