OP here is a link of my car before and after headers.
The car has a Airaid CAI
Magnaflow Competition Cat-Back
Bama 93H Tune
Then I added the BBK Long Tubes and the Catted X Pipe. 2011 V6 Mustang Start up and Rev before and after BBK LT Headers W/ Catted X Pipe - YouTube
2011 V6 Black Mustang Automatic: Magnaflow Competition Series Cat-Back Exhaust, Airaid Cold Air Intake, Raxiom Smoked Projector Headlights, Raxiom Smoked Aero Tail Lights, 93H-R3.1 Bama tune, BBK Long Tube Headers, BBK Catted X Pipe