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Your set of components/installation, specifically, has "induced" a resonant frequency that you're hearing. Some component is vibrating vigorously after the Gundo hack. Maybe just vibrating. Maybe vibrating and hitting another component like the frame. You will have to search for this vibration under the car. While there drone is evident, you'll inspect the muffler/areas and using a "stick", you'll carefully press on components or wedge them to try to influence the sound. The Gundo hack itself may need to be redone to increase or decrease the hole size or change the mass of a component to change the resonant frequency. A baffle might be loose. The issue is something specific to your vehicle. A methodical search will be needed. Change one muffler at a time.
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