This won't help you at all from a Roush perspective but here is a direct comparison of my friend's setup with and without resonators. I put the 2 clips back to back so you can compare the difference right away.
His setup is BBK Long Tubes, BBK Catted X-Pipe, Corsa Xtreme Axleback. Comparison with and then without resonators.
Deleting the resonators made it much louder but also not as deep.