Need resonator advice
 

I recently installed the SP supercat (with no resonator). On top of the headers and the Borla catback, honestly it sounds pretty awful. It's real buzzy in the midrange, so I'm wondering if anybody has experience with choosing a resonator.

I thought about cutting the res off the stock midpipe and using it to save cash, but I figured I might want to return it to stock sometime and not have to weld. Does anyone know of a good online resource for resonators and/or have a suggestion for which one will reduce the buzz in this application?

Thanks
Chris R.

Racing Beat sells them.