Exhaust Sound Comparison

[02g-machine]

I have Ford Racing Shorty Headers, a MAC Off-Road H Pipe, and welded in Flowmasters. I am thinking about either going to a MAC or Flowmaster American Thunder Cat-Back. What would be the sound difference between these two and how much louder would they be than my current setup.

 

[helty]

They sound similar, but I prefer Mac over Flows. Just meaner I think.