I’m trying to figure out what exhaust system/ muffler will make my truck as loud as possible. Some told me purple hornies… as that the next option or is there something better? I have a 2012 5.0

 

Borla Atak or Corsa Extreme if you looking for a system. Cheapest route - straight pipe.

 

I currently have no pipe. Just took it off at the cats. So I’m trying to find something that’s going to beat that

 

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This is what i was going to suggest, as it's literally the loudest it will get without removing the cats.

However, i do question what you're actually trying to do here, especially as you say, "i'm trying to find something that's going to beat..." no exhaust past the cats.
Are you trying for sheer volume? or just trying to get a loud, and decent sound from the engine?

I can tell you now that the Coyote does not sound good without exhausts, just the way it is.

 

my main goal is to just make it as loud ad possible. I didn’t know if there were systems that would be louder than no exhaust at all

 

No, it can just change the tone/note.

 

Custom headers with equal length tubing and then no cats or mufflers, collected into 2.5" or 3" pipes exiting at the sides of the vehicle in front of the rear wheels would be about as loud as one can get, I'd imagine.