2016 Mustang GT Loud Exhaust

I just ordered my GT and want to get a exhaust system for it, I'm looking for the loudest exhaust system that also delivers an aggressive tone, even when it is just idling it has a nice loud rumble to it, this is my first mustang, coming from an sti, so I have no idea of which exhaust system is best, I've seen borla catbacks however they sound quiet, might just be the video, and which type of exhaust is louder? Axle back or catback, I'm assuming catback, however I have no idea, thanks in advance

Why?
I mean, the car was designed by engineers who know their stuff, following rules and guidelines set by transportation and environmental agencies. The Mustang is already pretty loud, why do you want it louder? Have you considered getting headphones playing loud engine noises? How about it you were to make those engines noises with your mouth?

The point is that the Mustang is a car that has *class*. And class means that it does the noise it has to do to get the job done. Its noise is proportional to the power it has. If you make it louder while keeping the engine the same (i.e. No more power), you are cheapening the Mustang true spirit. And you are not worthy of a Mustang.