Just wanted to update on this.
So I went from the JDL Catted UEL to the JDL Catless UEL and the noise became worse. What it came down to was the the Nameless FP/OP's resonator essentially doing its job trying to keep the drone down. I switched to a JDL Ultraquiet Catted/Resonated FP/OP and the resonance went away in exchange for some added drone in the cabin. Turned out to be a non-issue, it was simply the front pipe doing its job.
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