HELP Roush Muffler Question

[BensEcoboost]

Can anyone help me i order the roush cat back and they sent me 4 mufflers instead of 2 and the mid pipes so they shop installed just the mufflers onto the stock ecoboost pipes and it sounds nothing like the video and sounds more like my old mbrp street will this change when i install the mid pipes and have a big increase in sound volume?

 

[07 Boss]

It's a cat-back, changing the midpipe won't make much difference. Remove the cat and it will increase the volume. But you will always have the turbo that will muffle some of the sound. If you want volume just run straight pipes??? Why bother with the muffler?