x-pipe / cat-back drone noise

SLPRCTM

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CALIFORNIA NEAR THE WATER.
I have the "quiet" Borla cat-back and everything was great until I installed the bassani catted x-pipe and now have developed a drone noise around 2200 rpm. I'm going to try some insulation on the floor and trunk floor to reduce this. Does any one have any sugestions on how to eliminate / reduce this noise? Would wrapping the x-pipe section with exhaust wrap help? Replacing the x-pipe or cat-back is not an option because the car sounds way to good outside. My car is a vert so I can only do so much noise-insulation. Any ideas?
 

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