I have the same catback as yours. I believe the drone comes from a combination of the engine noise and the exhaust system together. Perhaps this system is more race oriented than say an Nvidia or HKS. As others said, you could insulate the cabin and the trunk to reduce the vibration feel. I personally don't care too much as the only time I'm in those rpms is when I either accelerate or have to climb a hill. I accept the extra noise because "street race car".
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