Question regarding Resonator

When I eventually add a DC 4-2-1 RH, will it be necessary to change the Resonator? I have a Magnaflow Catback Exhaust setup currently. I would like to keep the current set up as is if possible, however, I am not certain the current resonator will be enough to keep the vehicle from being too loud with a RH. Any thoughts?

Thanks

Question regarding Resonator