2011 Ford Mustang 3.7L V6 BBK X Pipe no cats HD

This is my 2011 Ford Mustang v6 after I have installed the BBK X pipe without catalytic converters the other exhaust is Dynomax cat backs with ultra flow mufflers and 2 and a half inch with stock headers. I like the increase in volume and it reduced a lot of noise on the highway over 70MPH that I had, and runs way smoother than before the power is smoother throughout most of the rpm range too. However the rasp is not welcome, did not think that would as loud as it is with just the cats gone, even with my mufflers which were always super deep sounding. Think I may need to put resonators in there.