Just don't go with 2 resonators of the same size. It will create a unwanted resonance in the mid-band. I have 2 12" Topspeed resonators. I would suggest one large box type like a magna flow unit. If you are running 2 round ones, you can run like a 12" and an 18". I am only postulating those sizes as I do not have the formula to calculate the proper sizing.
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